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Pseudomorphs & Replacements Quartz
Posted by Rock Currier
Rock Currier December 29, 2010 08:52AMClick here to view Pseudomorphs & Replacements A & B. Click here to view Pseudomorphs & Replacements C. Click here to view Pseudomorphs & Replacements D to I. Click here to view Pseudomorphs & Replacements J to M. Click here to view Pseudomorphs & Replacements N to P. Click here to view Pseudomorphs & Replacements R to Z. Click here to view Best Minerals P, Click here to view and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.
Can you help make this a better article? What good localities have we missed? Can you supply pictures of better specimens than those we show here? Can you give us more and better information about the specimens from these localities? Can you supply better geological or historical information on these localities?
Included with the quartz pseudomorphs here are opal and chalcedony pseudomorphs after various minerals, fossils and crack fillings. These are listed below alphabetically by what ever it is they are after. Example: Quartz var. chalcedony after fossil wood will be listed with the Quartz after Fxxx pseudomorphs just before the Quartz after Galena pseudomorphs. Listing them this way keeps all the Quartz after fossils ofvarious plants and animals all grouped together.
Quartz after AnalcimeUSANew Jersey, Passaic Co., Paterson
Quartz aftter Anhydrite with GypsumBrazilRio Grande do Sul
Quartz var amethyst after Anhydrite?BrazilRio Grande do Sul
These amethyst geodes, or cathedrals as they are sometimes called are mined from flat laying basalt layers in Rio Grande do Sul, Brazil in large quantities. Perhaps a kiloton or two of them are produced each year. They are often cut in half and polished like this one is. Sometimes they have knobs and bumps and little stalactites of amethyst in them like this one. Sometimes they are said to be growing on what were at one time crystals of anhydrite but it is difficult to tell, unless you can see one of them broken open open or one that has been cut in half with a diamond saw. In some cases, these are found to be growing on prismatic calcite crystals. Here in Rio Grande, I think most of them may be formed after Anhydrite rather than Calcite. Other amethyst geodes, somewhat similar to these are mined from the basalts near Artigas, Uruguay, and these appear to be more commonly formed on calcite crystals. Stalactites from Uruguay are more common than Brazil. Most of the Uruguayan stalactites appear to have been formed on thin stringers of calcite?
Quartz after Anhydrite on amethystBrazilRio Grande do Sul, Alto Uruguai region, Iraí
Quartz after AnhydriteBrazilRio Grande do Sul, Alto Uruguai region, Iraí
Quartz after Anhydrite?USAColorado, San Juan Co., Silverton District, Silverton, Cunningham Gulch
Quartz after AnhydriteUSAConnecticut, Hartford Co., East Granby, Roncari quarry (Tilcon quarry)
Quartz after AnhydriteUSAConnecticut, Hartford Co., New Britain, Arute Field
Quartz after Anhydrite?USAConnecticut, New Haven Co., Southbury, O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry)
Quartz after Anhydrite with CalciteUSANew Jersey, Passaic Co., Paterson
Quartz casts after anhydrite and glauberite are very common in the basalts of the Watchung Mountains in New Jersey and have been popular with collectors in the region for more than 100 years. One of the classic references to these and other trap rock minerals of the region is The Crystal Cavities of the New Jersey Zeolite region by Waldemar Theodore Schaller. It is an old 1932 United States Geological Survey Bulletin #832. Because of their proximity to densely populated urban areas, the Basalt quarries of New Jersey may have been responsible for creating more mineralogists and collectors than any other group of localities in the world. They have been producing specimens for perhaps 200 years and are still producing specimens today. Although their eminence for producing fine specimens has been somewhat diminished during the last 20 years because of the zeolites produced in huge quantities in the basalt quarries in the Deccan Traps in India.
Quartz after Anhydrite with Calcite & LaumontiteUSANew Jersey, Passaic Co., Prospect Park, Prospect Park Quarry (Sowerbutt Quarry; Vandermade Quarry; Warren Brothers Quarry)
Quartz after ApatiteMalawiZomba District, Mt Malosa
Quartz var. chalcedony after ApatiteUSAUtah, Iron Co., Iron Springs District (Iron and Granite Mountains & Three Peaks), Black Sallly Mine
Quartz after ApophylliteUSA
Idaho, Custer Co., Challis
Quartz var. chalcedony after AragoniteArgentinaChubut, Paso de Indios, Valle de las Plumas
Quartz after AragoniteHungaryBorsod-Abaúj-Zemplén Co., Zempléni Mts., Nyíri, Kandó Hill
Quartz after AragoniteHungaryBorsod-Abaúj-Zemplén Co., Zempléni Mts., Telkibánya
Quartz var. chalcedony after AragoniteUSANew Mexico, Luna Co., Cooks Peak District, Cooks Peak area
Quartz var. chalcedony after AragoniteUSATexas, Brewster Co., Needle Peak (Sierra Aguja)
Quartz after AragoniteUSATexas, Brewster Co., Alpine, Woodward Ranch
Quartz after BaryteFranceAlsace, Haut-Rhin, Ste Marie-aux-Mines (Markirch), Grande Haldes
Quartz after BaryteIndiaMaharashtra, Jalgaon District
Quartz after BaryteMexicoZacatecas, Mun. de Concepción del Oro, El Cobre, Cobre Mine
Quartz after BariteMoroccoMeknès-Tafilalet Region, Khénifra Province
Quartz afer Barite with RealgarPeruHuancavelica Department, Angaraes Province, Julcani District, Julcani Mine
Quartz after BariteRomaniaMaramures Co., Cavnic (Kapnic; Kapnik)
Quartz after BariteRomaniaMaramures Co., Cavnic (Kapnic; Kapnik), Cavnic Mine (Kapnikbánya)
Quartz var. Chalcedony after BariteSlovakiaBanská Bystrica Region, Štiavnica Mts, Hliník nad Hronom
Quartz after BariteUSAColorado, Mesa Co., Frutia
Quartz after BariteUSAColorado, Ouray Co., Silver Point Mine
Quartz after BariteUSAColorado, San Juan Co., Arastra, Cunningham Gulch, Highland Mary Mine
Quartz after BariteUSAColorado, San Juan Co., Silverton District, Silverton, Cunningham Gulch
Quartz after BariteUSAColorado, San Juan Co., Silverton District
Quartz after Barite?USAColorado, San Juan Co., Silverton District, Howardsville, Sunnyside Mine (American Tunnel; Mogul Mine; Washington Mine; Belle Creole; Gold Prince; Brenneman Mine; Sunnyside Mine Group)
Quartz after BariteUSARhode Island, Providence Co., Cumberland, Diamond Hill
Quartz after BariteUSAUtah, Grand Co., Moab
Quartz after BariteUSAUtah, Tooele Co., Oquirrh Mts, Tooele District
Quartz after Beta-quartzGermanyRhineland-Palatinate, Eifel Mts, Polch, Ochtendung, Wannenköpfe
Quartz var. chalcedony with hematite? after calcite?AustraliaQueensland, Etheridge Shire, Agate Creek
Quartz var. opal after Calcite after Ikaite
AustraliaNew South Wales, Yungnulgra Co., White Cliffs
These are often referred to as opal pineapples. The ones that show some fire are particular rare, hard to get and very expensive. I don't think any of the ones showing fire would all cost less than 10K each. These may be the most valuable and sought after pseudomorph by collectors.
Quartz var. chalcedony after CalciteAustriaCarinthia, Friesach - Hüttenberg area, Hüttenberg
Quartz after Calcite septarin core (melicaria)BrazilRio Grande do Sul
Quartz after Calcite?BrazilRio Grande do Sul, Alto Uruguai region
Quartz after CalciteBulgariaPlovdiv Oblast, Rhodope Mts, Laki (Luki), Djurkovo Complex, Droujba (Drujba) Mine
Quartz after Calcite?BulgariaSmolyan oblast, Rhodope Mts, Madan ore field, Gradishte mine, Gradishte deposit
Quartz after Calcite on FluoriteChinaHunan Province, Chenzhou Prefecture, Linwu Co., Xianghualing Sn-polymetallic ore field, Xianghualing Mine (Hsianghualing Mine)
Quartz after CalciteFranceBurgundy, Saône-et-Loire, Lucenay-l'Evêque, La Petite-Verrière, Voltennes mine
Quartz after Calcite?GreeceMacedonia Department, Chalkidiki Prefecture, Cassandra Mines, Stratoni operations, Madem-Lakko Mine (Madem-Lakkos Mine; Madem Laccos Mine)
Quartz var. chalcedony after CalciteHungaryHeves Co., Mátra Mts., Gyöngyöstarján, Füledugó Quarry
Quartz after Calcite with HematiteHungaryHeves Co., Mátra Mts., Parádsasvár (Üveghuta), Béke adit
Quartz after CalciteIndiaMaharashtra, Jalgaon District
Quartz after CalciteIndiaMaharashtra, Mumbai District (Bombay District), Mumbai (Bombay), Ward 38, Malad
Quartz after CalciteIndiaMaharashtra, Nasik District
Quartz after Calcite septarian core (melicaria)MexicoChihuahua, Mun. de Julimes, Julimes
These are apparently fairly abundant, but they are not all that common because they don't bring a high price from collectors, and they require a lot of cleaning. The clay that fills their many cavities in these specimens requires a lot of work to remove. Before the advent of the little hand held high pressure fabric guns it would be nearly impossible to clean these specimen well.
Quartz after CalciteMexicoGuanajuato
Quartz var. chalcedony after CalciteMexicoSonora, Mun. de Nacozari de García
Quartz after CalciteMoroccoAtlas Mts, High Atlas Mts, Ourika Valley
Quartz var. chalcedony after CalciteNamibiaNamib Desert
Quartz var. chalcedony after CalciteNamibiaErongo Region, Usakos and Omaruru Districts, Erongo Mountain
Quartz after CalcitePakistanNorthern Areas, Baltistan
Quartz after CalciteRomaniaMaramures Co., Cavnic (Kapnic; Kapnik)
Quartz var. Chalcedony after CalciteSlovakiaBanská Bystrica Region, Štiavnica Mts, Banská Štiavnica Mining District, Banská Štiavnica (Selmecbánya; Schemnitz), Banská Štiavnica Mines
Quartz after Calcite & FluoriteSpainAsturias, Siero, La Collada area, La Viesca mine
Quartz after CalciteUKEngland, Cornwall, Wadebridge District, Area West of Wadebridge, St Minver, Pentire Glaze Mine
Note the "dirt" on the specimen. The chances are that this specimen is an old one. The reason behind this assumption is that most specimens today are cleaned better than this one to increase their value. During the last ten or fifteen years, collectors and dealers did not have access to the little fabric guns that are so handy in cleaning the dirt off of specimens. Chances are that if this specimen was found today, a minute or two in front of one of these little high pressure water guns would immediately clean the dirt off of this specimen. Often, just by looking at the amount of dirt on specimens in collections will give you a clue about how old it is.
Quartz var. amethyst after CalciteUruguayArtigas Department, Artigas
The various amethyst mines near the little town or Artigas in northern Uruguay have produced a lot of amethyst casts after Calcite. In some specimens, you can still see the calcite and I suppose if you put these in a solution of hydrochloric acid you could remove the calcite from them you could create your own casts after calcite. Some of them are really amazing, and are of course in demand by collectors.
Quartz after CalciteUSAArizona, Pima Co., Tohono O'odom (Papago) Indian Reservation
Quartz after CalciteUSAColorado, Ouray Co., Ouray District (Uncompahgre District)
Quartz after CalciteUSANew Mexico, Luna Co., Jose District
Quartz after CalciteUSANew Mexico, Luna Co., Jose District, Faywood Mine
Quartz after CalciteUSANew Mexico, Sierra Co., Cuchillo Negro District, Prospectors Delight mine
Quartz after Calcite?USANew Mexico, Socorro Co., Magdalena District, Kelly Mine
Quartz var. chalcedony after CalciteUSATexas, Brewster Co., Alpine, Woodward Ranch
Quartz after CalciteUSATexas, Reeves Co.
Quartz after DanburiteMexicoSan Luis Potosí, Mun. de Charcas, Charcas
Quartz after DatoliteUKEngland, Devon, Dartmoor & Teign Valley District, Ilsington & Ashburton Area, Ilsington, Haytor Mine
Quartz after EpidoteUSAWashington, King Co., North Bend, Green Mountain, Bessemer Ridge
Quartz after FeldsparUSANorth Carolina, Rutherford Co.
Quartz after FluoriteMoroccoAtlas Mts
Quartz after Fluorite?MoroccoMarrakech-Tensift-El Haouz Region, El Kelaâ des Sraghna Province, Sidi Rahhal
Quartz after FluroiteMoroccoMarrakech-Tensift-El Haouz Region, El Kelaâ des Sraghna Province, Sidi Rahhal
Quartz after FluoriteMoroccoOriental Region, Oujda-Angad Province, Touissit District, Touissit, Bou Bekker (Bou Becker)
Quartz var. chalcedony after FluoriteNamibiaKaras Region, Blinkpan
Quartz after FluoritePeruHuánuco Department, Dos de Mayo Province, Huallanca District, Huanzala Mine
Quartz var. chalcedony after Fluorite? Scheelite?PortugalVila Real District, Cerva, Macieira
Quartz after FluoriteRomaniaMaramures Co.,Trestia
Quartz after FluoriteUKEngland, Durham, North Pennines, Co. Weardale, Bollihope District
Quartz after Fluorite & FluoriteUKEngland, Durham, North Pennines, Co. Weardale, Westgate, Heights Quarry
Quartz after FluoriteUKEngland, Cornwall, Camborne - Redruth - St Day District, Gwennap, St Day United Mines (Poldice Mines), Wheal Gorland
Quartz var. chalcedony after FluoriteUKEngland, Cornwall, Liskeard District, Menheniot Area, Menheniot, Wheal Mary Ann
Quartz after FluoriteUKEngland, Cornwall, St Austell District, Tywardreath, Fowey Consols (incl. Wheal Treasure; Wheal Fortune; Wheal Chance)
Quartz var. chalcedony after FluoriteUKEngland, Cornwall, St Just District, St Just, Kenidjack Valley, Wheal Drea
Quartz after Fluorite & Sphalerite & GalenaUKEngland, Cumbria, North and Western Region (Cumberland)
Quartz after FluoriteUKEngland, Cumbria, North and Western Region (Cumberland)
Quartz after FluoriteUKEngland, Cumbria, North and Western Region (Cumberland), North Pennines, Alston Moor District, Nenthead, Rampgill Mine
Quartz after FluoriteUKEngland, Northumberland, North Pennines, West Allendale, Coalcleugh, Coalcleugh Mine
Quartz after FluoriteUSAColorado, Ouray Co., Ouray District (Uncompahgre District)
Quartz after Fluorite and ?USAColorado, San Juan Co., Eureka District, Gladstone, Gladstone Mine
Quartz after Fluorite and Barite?USAColorado, San Juan Co., Silverton District, Silverton, Genoa Claim
Quartz var. opal after fossil pineconeAustraliaNew South Wales, Finch Co., Lightning Ridge
Quartz var. opal after fossil plant stemAustraliaNew South Wales, Finch Co., Lightning Ridge
Quartz var. opal after fossil plant stemsAustraliaNew South Wales, Finch Co., Lightning Ridge, Coocoran Opal Fields
Quartz var. opal after fossil Hypsilophodontid dinosaur toothAustraliaNew South Wales, Finch Co., Lightning Ridge, Coocoran Opal Fields
Quartz var. opal after fossil bivalve mollusc shellAustraliaNew South Wales, Finch Co., Lightning Ridge, Coocoran Opal Fields
Quartz var opal after fossil woodAustraliaNew South Wales, Yungnulgra Co., White Cliffs
Quartz var. opal after fossil bivalve shellAustraliaSouth Australia, Andamooka Ranges - Lake Torrens area, Andamooka opal fields
Quartz var. opal after snail shellAustraliaSouth Australia, Andamooka Ranges - Lake Torrens area, Andamooka opal fields
Some collectors would murder their grandmother for one of these. These are very rare and I don't think I have ever seen more than two or three good ones.
Quartz var. opal after fossilAustraliaSouth Australia, Andamooka Ranges - Lake Torrens area, Andamooka opal fields
Quartz var Opal after fossil belemnitesAustraliaSouth Australia, Coober Pedy - Everard Range Regions, Coober Pedy
The fossils seen here are not in their natural state. They have been removed from the matrix and their exteriors polished and put back into the matrix. The example on the right looks a bit cracked and this may or may not have been caused by the heat generated during the polishing process because opal is rather heat sensitive.
Quartz, var Chalcedony after fossil woodCzech RepublicBohemia (Böhmen; Boehmen), Plzen Region, Plzen-North, Kralovice, Plasy, Kaznejov
Quartz var Chalcedony with Fluorite after fossil woodGermanySaxony, Chemnitz, Hilbersdorf
Quartz var. Chalcedony after fossil gastropodRussiaPovolzhsky Region, Saratov Oblast', Danguz village
Quartz var. Chalcedony after fossil woodUSAArizona, Apache Co., Petrified Forest National Monument, Petrified Forest
Fine specimens of petrified wood from this locality are justifiably world famous. I don't think that any other locality has produced such fine, large, beautiful and abundant specimens. More than anything else their fame rests on the beautiful colors of various reds, yellows and blue that specimens from here sometimes display all in the same piece. Petrified wood from most other locations seem drab in comparison. Some of these logs can be several feet in diameter and weigh so many tons that they have not been moved from their original locations. The Lyon's share of these specimens have thankfully been preserved inside the Petrified Forest National Park near Holbrook, Arizona, USA, but on ranches surrounding the national park, there is still a lot of material that is available and from time to time will still be collected and cut and polished into beautiful "rounds". Some of the logs that have been found are too big to be moved and have been cut into sections in place by big wire saws that have been erected at the site of these logs. Beautiful slabs of logs from this locality more than a meter in diameter have been cut and polished and are cherished by those who have them and admired by those who have seen them. They are worth many thousands of dollars each.
Quartz var. chalcedony after fossil woodUSAArizona, Navajo Co., Holbrook
Quartz var opal after fossil woodUSANevada, Humboldt Co., Virgin Valley District
The black fire opal limb casts are highly valued by collectors and the fine ones often sell for many thousands of dollars. They are generally considered to be not very stable and subject to cracking over time after being removed from the ground. Usually they are kept oil or water to preserve them. Back in the day one of the persons who dug and specialized in this kind of opal was Kieth Hodson who lived in Phoenix, Arizona. He lived in Phoenix because the winter weather at the opal mines in Nevada was so bad that you didn't want to live there if you could help it, let alone try and dig there. In his store, he had a fish tank, and in the bottom of the fish tank were fine large precious opal limb casts which by todays standards would be worth several million dollars. It was an amazing sight.
Quartz var. chalcedony after fossil woodUSAUtah, San Juan Co.
Quartz var chalcedony after fossil woodUSAUtah, Wayne Co., Hanksville
Quartz var. chalcedony after woodUSAWyoming, Fremont Co., East Fork Wind River
Quartz var. chalcedony after fossil woodUSAWyoming, Sweetwater Co., Eden Valley, Hay's Ranch
Quartz v. chalcedony after fossil coralUSAFlorida, Hillsborough Co., Tampa, Tampa Bay
These chalcedony pseudomorphs after coral have been collected and appreciated by collectors for more than 100 years. Some collectors have specialized in collecting them and have set up little lapidary factories in their garages to cut and polish these beautiful objects.
Quartz var. Chalcedony after fossil shellUSAFlorida, Hillsborough Co., Tampa, Tampa Bay, Davis Islands
These are quite rare and I have never been able to find a good one for my collection in spite of looking for one for more than 40 years.
Quartz after fossil shellUSAGeorgia, Burke Co., Girard District, Girard
Quartz var. chalcedony after fossil Collenia undosa stromatolitesUSAMinnesota, St. Louis Co., Mesabi Range, Mary Ellen Pit
Quartz var. chalcedony after fossil coralUSAUtah, Summit Co., Woodland, Woodland Quarry
In the past, these were abundant and I have seen hoards of this material in the hands of various field collectors of several hundred pounds, but today they are almost a thing of the past.
Quartz after GlauberiteUSANew Jersey, Passaic Co., Little Falls Township, Houdaille Quarry (Consolidated Stone and Sand Company Quarry; Consolidated Quarry)
Quartz after GlauberiteUSANew Jersey, Passaic Co., Paterson
Quartz after GlauberiteUSANew Jersey, Passaic Co., Paterson, Lower New Street quarry
Quartz after GlauberiteUSANew Jersey, Passaic Co., Paterson, Upper New Street Quarry (Burger's Quarry)
Quartz after GlauberiteUSANew Jersey, Passaic Co., Prospect Park, Prospect Park Quarry (Sowerbutt Quarry; Vandermade Quarry; Warren Brothers Quarry)
Quartz after GypsumUSANebraska, Dawes Co.
Nebraska is one of the states in the United States that politically correct people might call, mineralogically challenged. These are one of the few localities for mineral specimens that the state has. Because I wanted something in my collection from my Fathers home state I bought a mud pseudomorph after halite and it looks even worse than these specimens do. That will give you some idea how bad things are for mineral collectors living in Nebraska.
Quartz var. chalcedony after GypsumUSANebraska, Dawes Co., Crawford, Crawford Dam
Quartz after HaliteUSAArizona, Yavapai Co.
Quartz after HaliteUSAPennsylvania, Perry Co., Ickesburg
Quartz after HeulanditeIndiaMaharashtra, Jalgaon District
Quartz after LaumontiteUSAColorado, Teller Co., Cripple Creek District
Quartz after Laumontite?USAColorado, Teller Co., Cripple Creek District, Moffat Tunnel
Quartz after LaumontiteUSAConnecticut, New Haven Co., Southbury, O & G Southbury Quarry (Silliman Quarry; O & G No. 2 Quarry)
Quartz after LaumontiteUSAConnecticut, Tolland Co., Stafford, Diamond Ledge
Quartz after Magnesioriebeckite-Riebeckite Series var. crocidolite
CanadaOntario, Rainy River District, Hutchinson Township, Atikokan
Quartz after Melanophlogite?FranceAuvergne, Puy-de-Dôme, Pont-du-Château
Quartz var. Chalcedony after MordeniteHungaryHeves Co., Mátra Mts., Gyöngyösoroszi, Károlyvár
Quartz after ScheeliteUKEngland, Devon, Okehampton area (Northern Dartmoor), Ramsley Mine
Quartz var, chalcedony agate after Scolecite?GermanyRhineland-Palatinate, Alzey, Nack, Teufelsrutsch
Quartz after SideriteUKEngland, Cornwall
Quartz ater StibniteChinaGuizhou Province, Qianxi'nan Autonomous Prefecture, Qinglong Co., Qinglong (Dachang) Sb-Au deposit
Quartz var. Chalcedony after Stilbite?South AfricaNorthern Cape Province, Kalahari manganese fields, Hotazel, Wessels Mine (Wessel's Mine)
Quartz after ThenarditeGermanyBaden-Württemberg
Thenardite pseudos were reported in fine grained Volcanic Tufa, on Rosenegg Hill, in Hegau, South of Baden. The volcanic setting would seem to preclude the formation of Ikaite. Leuze(1886 & 1889) first noted the local for Calcite and rarer Quartz after Thenardite. Crystal diagrams, some as rare Twins, are included in Goldschmidt, under Thenardite.
Quartz after WulfeniteMexicoDurango, Mun. de Mapimí, Mapimí, Ojuela Mine
Quartz after WulfeniteNamibiaOtjikoto (Oshikoto) Region, Tsumeb, Tsumeb Mine (Tsumcorp Mine)
Quartz after WulfeniteUSAArizona, Gila Co., Dripping Spring Mts, Banner District, Hayden area, Chilito, Keystone Gulch, Reagan claims (Regan/Reagan Camp prospects; Lee Reagan property; Lee Reagan prospects; Kullman-McCool group), Finch Mine (Barking Spider Mine)
Quartz after ?ChinaHubei Province, Huangshi Prefecture, Daye Co.
Quartz after ?FranceAuvergne, Allier, Ébreuil, Échassières, Beauvoir quarry
Quartz after ?PortugalVila Real District, Macieira, Cerva
Quartz after ?USARhode Island
Click here to view Pseudomorphs & Replacements A & B. Click here to view Pseudomorphs & Replacements C. Click here to view Pseudomorphs & Replacements D to I. Click here to view Pseudomorphs & Replacements J to M. Click here to view Pseudomorphs & Replacements N to P. Click here to view Pseudomorphs & Replacements R to Z. Click here to view Best Minerals P, Click here to view and here for Best Minerals A to Z and here for Fast Navigation of completed Best Minerals articles.
Images last selected December 2010 sorting on "after".
Crystals not pistols.
Edited 37 time(s). Last edit at 10/30/2012 07:07PM by Rock Currier.
Don Windeler January 16, 2011 09:12PMRock,
Per comments in "A to C", I'm posting a set of specimens that hit localities and/or replacements not well represented in the articles at present, rather than saying these are all The Best. Thank you for your efforts!
Chalcedony after aragoniteChalcedony after aragonite
Needle Peak (Sierra Aguja), Brewster Co., Texas, USA
Brewster Co. is already represented, but these two examples are pretty sharp.
Quartz after anhydrite
São Gabriel, Rio Grande do Sul, Brazil
I added this one because the locality is different, but there are certainly better examples in the Rio Grande do Sul galleries. Not currently "approved" photo.
Quartz after barite
Frauenstein, Weisbaden, Germany
Quartz after calcite
Santa Eulalia District, Mun. de Aquiles Serdán, Chihuahua, Mexico
Quartz after fluorite
Aurora District, Mineral Co., Nevada, USA
Rock Currier January 16, 2011 10:56PMDon, Thanks for your input on the Pseudomorphs of Quartz. Unfortunately it is my job to be the Devels advocate or perhaps St Peter at the gate and feel I need to make the following observations.
I would use you Needle Peak pseudo except for the fact that the specimen is not in focus. Have you considered taking you pictures with a tripod to reduce hand shake and to stop you aperture down to f22 so that the entire specimen will be in focus?
The Quartz after Anhydrite, at least that is what we presume them to be after does not come from Sao Gabriel. Sao Gabriel is/was a very small town in Rio Grande do Sul state near some of the amethyst/agate mines, but those mines never produced any of these type of casts. In fact during all my visits there, I never saw anything like those offered for sale by the local miners and distributors.
The Quartz after Barite looks suspiciously like Quartz after Anhydrite. I don't know much about the pseudos from that locality. How sure are you that those are pseudos after Barite?
Have you checked the hardness of the Quartz after Calcite? Will they scratch a crystal of orthoclase feldspar?
The Quartz after Fluorite looks good. Are there any of the pseudos on the back side broken open and if so is there any fluorite in place? We try not to include coating of quartz on other minerals as pseudomorphs in the article.
I have not taken the time yet to look at your other suggestions carefully, but will soon find the time to do that.
Crystals not pistols.
Don Windeler January 17, 2011 05:31AMRock:
Thanks for the feedback. I had every expectation that you and/or others would raise questions on some of the pieces I flagged -- these wiki environments would be far less useful if that weren't the case. My main failing here is probably in believing the labels. I'll hit your points in order.
> I would use you Needle Peak pseudo except for the
> fact that the specimen is not in focus. Have you
> considered taking you pictures with a tripod to
> reduce hand shake and to stop you aperture down to
> f22 so that the entire specimen will be in focus?
I'll go back and reshoot. I did use a tripod and knew this one was not in focus for the entire sample, but actually liked the look of it anyhow. My set-up is pretty crude and I'm no expert, but I'll play around and see what I can do.
> The Quartz after Anhydrite, at least that is what
> we presume them to be after does not come from Sao
> Gabriel. Sao Gabriel is/was a very small town in
> Rio Grande do Sul state near some of the
> amethyst/agate mines, but those mines never
> produced any of these type of casts. In fact
> during all my visits there, I never saw anything
> like those offered for sale by the local miners
> and distributors.
I bought this one from Si and Ann Frazier, who I typically trust on all things quartz. Their label is listed as "Daniello Mine, Sao Gabriel" -- I've not been able to find any other reference to this locality, however. I'll check with them in the next few days to see if they have any more information.
> The Quartz after Barite looks suspiciously like
> Quartz after Anhydrite. I don't know much about
> the pseudos from that locality. How sure are you
> that those are pseudos after Barite?
Funny you highlight that -- I was starting to wonder the same. I was trying to figure out what a little mm-scale mineral on the regular quartz could be and was looking at the other minerals from the locality. When I saw anhydrite, it got me thinking because it sure looks a lot like the habit of the Brazilian anhydrites. Roger Lang had once pointed me to a link on mineralienatlas.de that confirmed Frauenstein was a real locality with barite present, but I don't know German at all and my browser doesn't like that site very much.
> Have you checked the hardness of the Quartz after
> Calcite? Will they scratch a crystal of orthoclase
Have now tried in several places without luck, so it may not be quartz after all. Compared to several other Sta Eulalia pseudos I have, though, this one really does look like quartz and intergrown with the pseudos are little elongate crystals that seem to have hexagonal shapes; I can't get them to scratch the feldspar either, though.
> The Quartz after Fluorite looks good. Are there
> any of the pseudos on the back side broken open
> and if so is there any fluorite in place? We try
> not to include coating of quartz on other minerals
> as pseudomorphs in the article.
There are definitely parts that are broken open along the edges, but all are completely hollow with no evidence of fluorite anywhere. I think these qualify as epimorphs, in that the quartz doesn't seem to have replaced the fluorite but rather coated it and then outlasted it.
> I have not taken the time yet to look at your
> other suggestions carefully, but will soon find
> the time to do that.
I appreciate the consideration and the effort you put in to all of the MinDat work!
Don Windeler January 19, 2011 07:19AMRock:
Finally got the Needle Peak piece to be fully in focus and at a decent perspective. I hope this fits the guidelines better:
Quartz after aragonite
I'll write Si & Ann about the Sao Gabriel piece and check if they have any more info to add.
Rock Currier January 19, 2011 01:09PMDon,
Yep! that will do it. Ill put it in the article. Have you ever collected there? Its near the well known agate locality of the Woodard Ranch in Texas. I have seen these things around for years and wondered just how wide spread they are.
Crystals not pistols.
Larry Maltby January 19, 2011 04:06PMI have a copy of the “Glossary of Geology” produced by the American Geological Institute. It defines pseudomorph as:
“A mineral whose outward crystal form is that of another mineral species. It has developed by alteration, substitution, incrustation, or paramorphism.”
If this is the accepted mineralogical context of the word pseudomorph, then petrified wood and other fossils would be eliminated because their form is not another mineral species. I hope that this comment is considered constructive at the time when the pseudomorph pages are being developed. Actually it makes no difference to me if a more general definition is used, the pages are beautiful and instructive and I enjoy looking at them.
Respectfully, Larry Maltby
Rock Currier January 19, 2011 08:43PMLarry,
Thanks for bringing that "official" definition of a pseudomorph to my attention. I think that in the introductory remarks we will probably cite several different "official" definitions which will probably show that different people and organizations have different opinions as to what a pseudomorph is. I need to find someone to translate Blum's original definition as well. In these articles we will include a number of examples of things that can be considered pseudomorphs only the the loosest definition, like ice after water, minerals after old coins, atacamite after mouse etc. but in the text describing these pseudomorphs we will indicate that we have stretched the definition a bit. I would like to use the articles to get the idea across that perhaps our definition of exactly what a mineral is, is too strict and that mineralogists should "claim more territory" if they want to see the decline in mineralogical education stopped or reversed.
Crystals not pistols.
Peter Haas January 28, 2011 03:57AM@Don,
Your quartz after baryte is in fact most almost certainly quartz after anhydrite. While I don't remember a specific reference to Frauenstein, quartz after anhydrite has been described from (and is occasionally abundant in) the area around of Wiesbaden.
Don Windeler January 30, 2011 06:48PMPeter:
Thank you for the confirmation -- I'll change the description of that piece, as well as my label. Might also hit it with a water gun and re-shoot, as looking it over with the hand lens made me realize it was a little grotty.
I should have posted this note here instead of as a throw-in for "D to I", but for these quartz pseudos I'd also nominate the quartz after garnet samples from Garnet Hill in Calaveras Co. There's one good one in the database already: quartz after garnet.
This locality also has interesting epidote after garnet, but my example wouldn't make the cut here. I know a few people who probably do, though, and I think I can get a little commentary on the occurrence of these pseudomorphs at the site. Most likely this will be after Tucson, given many of the principals are likely out of town. I'll take notes if I run into them there.
Mike Menzies April 20, 2013 03:37PMRock,
For additional info on Chalcedony pseudomorphs after what are believed to be Melanophlogite, see my article "Unusual Quartz and Chalcedony Pseudomorphs from Canada's Alberta Badlands" in the Nov / Dec 2012 issue of Rocks & Minerals.
I can supply photos, including but not limited to those in the article.
Some of these pseudos take a plate-like form similar to Patrice Cmolik's specimen from Auvergne, Puy-de-Dôme, Pont-du-Château, France that's already in your article. The Alberta specimens are, however, less gemmy.
Volkmar Stingl April 20, 2013 10:31PMHi Rock,
I can add 2 pictures of quartz pseudomorphs from a Chinese locality. The quality of the pictures is not very good, but I think these are interesting additions regarding the locality. If you want, you can use the pictures.
Both pieces are self-collected in 2012 resp. 2013 in Yongping Cu-mine, Shangrao Pref., Jiangxi Prov., PR China.
Quartz var. Chalcedony ps. calcite on fluorite (width about 4 cm, find from 2012-12-02)
Quartz ps. fluorite (width about 7 cm, find from 2013-01-13)
open | download - 121202 Yongping 10a.JPG (243 KB)
open | download - 130113 Yongping 03.JPG (244.1 KB)
open | download - 130113 Yongping 03.JPG (244.1 KB)
Rock Currier April 21, 2013 02:34AMVolkmar,
Before I can put an image in a Best Minerals article, they must be formerly uploaded to Mindat's database. Would you like to do that? Do you need instructions on hot to do it? The reason for this is to clear up copyright issues regarding the photos and to make it accessible to anyone searching for that mineral on mindat.
Crystals not pistols.
Mike Menzies April 23, 2013 11:09PMRock,
I've now uploaded the 5 images of my chalcedony pseudos, but had some difficulty accessing and using the Photo Upload form.
In particular I was unable to enter a new locality, so please note that three of the specimens (my catalogue nos. MC16, UL1 and DW51), are from a new locality, as follows:
Battle River, northeast of Donalda, Alberta, Canada.
The minerals found at this location are:
For the Drumheller locality, you can also add Gypsum to the minerals list (crystals on specimens that I've collected)
The literature reference for both locations( Drumheller, and Battle River) is as follows:
Menzies, M.A., and Frazier, S. (2012) Unusual quartz and chalcedony pseudomorphs from Canada’s Alberta badlands. Rocks & Minerals, 87, 6, 512-521.
Would it be possible for you to make the changes?
Rock Currier April 24, 2013 08:05PMMike,
Thanks for uploading those images. They are really interesting and Ill use them once we, or rather you get the new locality entered in Mindat. I know the first time around this may seem a little hard to do, but the fact that you managed to upload some images indicates a degree of computer literacy.
To enter new localities in Mindat, you need to do that from the locality pages, not the photo upload page. In you case you will need to go to the Alberta locality page:
And then click on the Edit/Add Sub Locality menu choices. I think you should be able to figure it out from there. Once the locality has been entered, you will be able to go back to your images and find the correct locality already in the system, select it and update the data on the photo upload page. Let me know if you have any problems.
To get to Alberta, just go to the locality field at the bottom of any page in type in Alberta.
Crystals not pistols.
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2017, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.