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Dolomite

Posted by David Von Bargen  
avatar Dolomite
March 07, 2011 04:13PM
Click here to view Best Minerals D 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?


DolomiteCaMg(CO3)2 trigonal

Dolomite, Azcárate Quarry, Eugui, Esteribar, Navarre, Spain 4.4cm wide

Dolomite is a common rock forming mineral in sedimentary and metamorphic (marble) rocks. It is also formed in hydrothermal veins, magnesium rich altered igneous rocks and rarely in pegmatites. Many million tons of fine grained dolomite are quarried each year for use as aggregate.

The mineral forms large rhombohedral crystals, some steep rhombohedrons forming prisms and rarely as tabular crystals. Dolomite is most commonly available as drusy coatings of small crystals forming the matrix for sedimentary specimens of sulfides and fluorite. Good crystals of dolomite are relatively rare. Although they are not as large as other specimens the color of cobaltain dolomite makes specimens from Morocco and Congo very popular with collectors. Dolomite is a relatively common mineral pseudomorphing other carbonates (especially calcite) and forming fine grained coatings on other minerals. Another desirable habit is the saddle shaped crystals (deformed, offset rhombohedrons).


DolomiteAustraliaTasmania, Queenstown district, Mount Lyell Mines, Prince Lyell Mine

Dolomite with Hematite 3.5cm wide




DolomiteAustraliaTasmania, Zeehan district, North Dundas, Renison Bell Mine

Dolomite with secondary Dolomite ~2.5cm wide




DolomiteAustraliaWestern Australia, Comet Vale Township, Lake Goongarrie

Weathered rhomb of Dolomite 8cm wide




DolomiteAustriaSalzburg, Lungau, Murwinkel, Rotgülden, Lower Rotgülden lake, Water tunnel

Hemisphere of Dolomite 2.4cm wide




DolomiteAustriaStyria, Bruck an der Mur, Laming valley, Oberdorf an der Laming, Magnesite deposit

Dolomite with Quartz 8cm wide
Dolomite with Strontianite 12cm


DolomiteAustriaStyria, Niedere Tauern Mts, Hohentauern, Sunk

Dolomite 5.5cm wide




DolomiteAustriaStyria, Niedere Tauern Mts, Hohentauern, Sunk, Magnesite deposit

Dolomite 10.5cm wide




DolomiteBrazilBahia, Brumado

Dolomite 11cm wide
Dolomite & minor Magnesite16cm wide


Dolomite 3.8cm wide
Dolomite & Magnesite 4cm


Dolomite 6.2cm wide
Twinned dolomite 2.9cm wide


Dolomite on Quartz ~6.5cm tall
Dolomite 7.2cm wide


DolomiteCanadaBritish Columbia, Golden Mining Division, Radium Hot Springs, Mount Brussilof mine

Dolomite 3.3cm wide
Dolomite 6cm


DolomiteCzech RepublicBohemia, Karlovy Vary Region, Horní Slavkov

Dolomite & minor Quartz etc.11cm wide




DolomiteDemocratic Republic of CongoKatanga

Dolomite var cobaltoan 2.4cm
Dolomite var. cobaltan FOV2cm



DolomiteDemocratic Republic of CongoKatanga, Katanga Copper Crescent, Western area, Kolwezi, Mashamba West Mine

Dolomite var. cobaltoan 1.9cm tall




DolomiteFranceLanguedoc-Roussillon, Gard, Anduze, Saint-Félix-de-Pallières, Pallières Mines

Dolomite 8cm wide




DolomiteGreeceAttikí Prefecture, Lavrion District, Lavrion District Mines, Lavrion, Km-3 Mine

3mm Dolomite xl. cluster on Hematite




DolomiteGreeceMacedonia Department, Chalkidiki Prefecture, Cassandra Mines, Stratoni operations, Madem-Lakko Mine

Dolomite & Calcite ~5cm
Dolomite 7cm


4.5cm




DolomiteHungaryBorsod-Abaúj-Zemplén Co., Rudabányai Mts., Alsótelekes, Gypsum-anhydrite quarry

Dolomite FOV 4mm wide




DolomiteIranHormozgan Province, Hormuz Island

Dolomite 1.9cm wide & 2mm thick




DolomiteIrelandSligo, Aughamore Quarry

Dolomite 5cm tall




DolomiteItalyPiedmont, Torino Province, Canavese District, Chiusella Valley, Traversella, Traversella Mine

Dolomite ~3cm wide
4cm Dolomite crystals


DolomiteItalySardinia, Carbonia-Iglesias Province, Domusnovas, Oridda Valley, Barrasciutta Mine

Dolomite 13.5cm wide




DolomiteKosovoKosovska Mitrovica, Trepča valley, Trepča complex, Stari Trg Mine

Dolomite & small Calcite 6cm wide




DolomiteMexicoChihuahua, Mun. de Aquiles Serdán, Santa Eulalia District, East Camp, San Antonio Mine

Dolomite 3.2cm tall cm




DolomiteMexicoChihuahua, Mun. de Saucillo, Naica

Dolomite ~15cm wide




DolomiteMexicoGuanajuato, Mun. de Guanajuato, Guanajuato, San Juan de Rayas Mine

Dolomite ~9.5cm wide




DolomiteMoroccoOriental Region, Oujda-Angad Province, Touissit District, Touissit

Dolomite on Sphalerite 5.1cm wide
Dolomite 12cm wide


DolomiteMoroccoSouss-Massa-Draâ Region, Ouarzazate Province, Tazenakht, Bou Azzer District, Aghbar, Aghbar Mine

Dolomite var cobaltoan 4.8cm wide
Dolomite var. cobaltoan 5cm wide


DolomiteMoroccoSouss-Massa-Draâ Region, Ouarzazate Province, Tazenakht, Bou Azzer District, Bou Azzer

Dolomite var cobaltoan 4cm wide
Dolomite var cobaltoan 4.2cm wide


DolomiteMoroccoSouss-Massa-Draâ Region, Ouarzazate Province, Tazenakht, Bou Azzer District, Bou Azzer, Bou Azzer East deposit

Dolomite var cobaltoan FOV 3cm
Dolomite var cobaltoan FOV 7mm wide


DolomiteNamibiaOtjikoto Region, Tsumeb, Tsumeb Mine

Dolomite var cobaltoan 8.8cm wide
Dolomite var cobaltoan 5.4cm wide


Dolomite & minor Dioptase 8cm
Dolomite & Calcite 7cm wide


DolomitePortugalBeja District, Castro Verde, Neves-Corvo Mine

Dolomite 6cm wide
1cm Dolomite xls with Chalcopyrite


DolomitePortugalCastelo Branco District, Covilhã, Panasqueira, Panasqueira Mines

Dolomite on Arsenopyrite 15cm tall




DolomiteRomaniaMaramures Co., Baia Mare, Chiuzbaia, Herja Mine

Dolomite 8cm wide
Dolomite on Quartz 6cm wide


DolomiteRomaniaMaramures Co., Baiut

Dolomite 4cm wide
Dolomite 6cm wide


Dolomite 13cm wide




DolomiteRomaniaRomania, Maramures Co., Cavnic

Dolomite & Chalcopyrite 14cm cm wide




DolomiteSpainAragón, Teruel, Ojos Negros, Ojos Negros iron mines

Dolomite 7cm
Dolomite 12cm


DolomiteSpainAragón, Teruel, Teruel, Salobral ravine

Dolomite FOV 1.7cm
Dolomite xls ~1cm


DolomiteSpainCastile-La Mancha, Guadalajara, Setiles, Castilla quarry

Dolomite 3cm wide
2cm Dolomite xl


DolomiteSpainNavarre, Esteribar, Eugui, Azcárate Quarry

Dolomite 7cm tall
Dolomite, main xl 1.7cm wide


Dolomite 5.5cm wide
Dolomite ~15cm wide


Dolomite 5.2cm tall
Dolomite 5cm wide


Dolomite 6.7cm wide
Dolomite ~10cm wide


Dolomite ~15cm tall




DolomiteSpainValencian Community, Valencia, Chelva, Domeño, CV-35 Highway cut

2.5cm Dolomite xl
1.5cm Dolomite xl


2cm Dolomite xl




DolomiteSwitzerlandGrischun, Engadin, Scuol, Tarasp

Banded sinter dolomite.

Dolomite, cut & polished 5cm tall




DolomiteSwitzerlandWallis, Binn Valley, Freichi area, Wyssi Flue

Dolomite 5.2cm wide




Dolomite SwitzerlandWallis, Binn Valley, Im Feld, Lengenbach Quarry

Twined 2.5mm Dolomite xl




DolomiteSwitzerlandWallis, Brig, Simplon pass area, Simplon Railway tunnel

Dolomite ~5.5cm tall
Dolomite FOV 5.5cm wide


DolomiteUSAArizona, Pinal Co., Tohono O'odham Indian Reservation, Vekol Mts, Vekol District, Kohatk, Reward Mine

Dolomite 6.5cm wide




DolomiteUSAArkansas, Lawrence Co., Lawrence County Zinc District, Black Rock

Dolomite 8.2cm wide




DolomiteUSAKansas, Cherokee Co., Tri-State District, Picher Field, Baxter Springs

Dolomite & Chalcopyrite ~7.5cm
Back side of left


DolomiteUSAKentucky, Lincoln Co., Halls Gap, US 27 roadcut

Dolomite 1.5cm wide




DolomiteUSANorth Carolina, Alexander Co., Stony Point
Dolomite to 10cm. Associated with muscovite and rutile from pegmatites. We need a photo of this.


DolomiteUSAPennsylvania, Lancaster Co., Manheim Township, East Petersburg, Binkley-Ober Quarry

Dolomite 11.3cm wide




March 8, 2011.



Edited 19 time(s). Last edit at 03/11/2011 12:12PM by Rock Currier.
avatar Re: Dolomite
March 08, 2011 10:50PM
David,
Nice start. For some reason the BB code using height instead of width does not seem to allow the images to go next to other but insists on putting one above the other, and I have not figured out yet what is going on with that. When I get the time, Ill tweak your images around a little to make them look better.

Rock Currier
Crystals not pistols.
Re: Dolomite
March 09, 2011 07:54PM
David,
Co. Sligo, Ireland has produced abundant and excellent specimens of Dolomite, which are frequently seen at mineral shows in the UK. A few are pictured under that locality, especially from Aughamore Quarry and Abbeytown mine & quarry. Stephen Moreton has collected many excellent specimens (including one large one in my collection), and will be knowlegeable about the locality. I am sorry that I don't have the equipment to photograph my own. Becky
avatar Re: Dolomite
March 09, 2011 09:56PM
David,
The Rabbit Lake Mine at Wollaston Lake, Saskatchewan produced some nice dolomites that you may want to include. An example follows.
Michael

Attachments:
open | download - 1033 Dolomite.jpg (326.4 KB)
avatar Re: Dolomite
March 09, 2011 10:12PM
Michael,
That is indeed a fine dolomite and might be included in the article, however it would first have to be uploaded to the Mindat image bank. Do you know how to do this procedure?

Rock Currier
Crystals not pistols.
avatar Re: Dolomite
March 11, 2011 12:13PM
Dave,
I have tweaked the formatting a little to bring it more in line with the rest of the articles.

Rock Currier
Crystals not pistols.
avatar Re: Dolomite
April 04, 2011 02:00PM
    
http://www.mindat.org/loc-11387.html

This mine produced outstanding dolomites. Ask Roger Lang for an appropriate photo.
There are two more German localities that merit to be included in a best-of-species list:

(1) Grevenbrück: http://www.mindat.org/gallery.php?loc=14843&min=1304
(2) Rammelsbach: http://www.mindat.org/loc-39546.html

Both produced dolomite pseudomorphs after calcite. I'm not familiar with the situation at Grevenbrück, but Rammelsbach produced plates to several tens of centimeters with pseudomorphs to more than 10 cm in size. When they were first discovered, they were abundant, but the productive zone is now quarried away. Large specimens were often rather boring, though, because of the uniform crystallization and lack of associated minerals. I will try to contribute a picture.



Edited 1 time(s). Last edit at 04/04/2011 02:13PM by Peter Haas.
Re: Dolomite
April 06, 2011 09:05PM
A few snapshots of dolomites from Trepca, with courtesy of the other collectors who kindly gave me these specimen.

In fact, everybody should be aware that the chemical and mineralogical composition of Trepca carbonates slide within a kind of double pyramid having at its peaks dolomite, ankerite, siderite, kutnahorite, calcite, rhodochrosite...







Warm regards

Jean
Attachments:
open | download - Images_AuktionImages_31üü3.jpg (48 KB)
open | download - Images_AuktionImages_31üü4.jpg (55.4 KB)
open | download - Manganocalcite-CAM54833-01.jpg (22.2 KB)
Re: Dolomite
April 06, 2011 09:12PM


Attachments:
open | download - Manganocalcite-CAM54833-05.jpg (21.7 KB)
open | download - Manganocalcite-CAM54833-06.jpg (23.5 KB)
avatar Re: Dolomite
April 06, 2011 09:31PM
Feraud,
Thanks for the pictures. Just to let you know we can not use them unless they are first uploaded to the mindat gallery. Do you know how to do that? If you would like to do that, let me know and I will raise you to a level one and give you a link to the instructions on how to upload images to the mindat gallery. We don't show any images in Best Minerals unless they have first been uploaded to the mindat gallery. When you upload the images you will choose between several different flavors of copyright protection. Also, we rarely show pictures in Best Minerals other than images of the entire specimen, although if there are interesting features on the specimen we will sometimes show the full picture and next to it, a close up of the interesting part. Your pictures are pretty good and I would imagine that at least one or two of them would be included in the article. However, the person who writes the Best Mineral article about a particular country has the authority to choose what ever images they wish to put in the article. Thats about all the reward they get other than their name on the article for doing the large amount of work involved.

Rock Currier
Crystals not pistols.
Azogue
Re: Dolomite
April 08, 2011 06:37PM
Thank you Rock for your efforts

I am 63 and (despite the constant progress of medecine) it takes me long efforts to publish on the web. I'm just pactising Word, Pdf, Ppt, Excel and sometimes Access. Within 2 years I will be retired and (they say) I expect plenty freetime at that time, enough to fully collaborate with the other desperate collectors, scientists and goodwilling people your are.

Therefore I think it is untimely to promote me to the upper level, or at least it would be worth do be done but I do not promise to feed the databank as generously as I imagine I will do within two years.

Anyway, I'm sure Mindat will survive (despite it needs from you to sum up huge work and to face many disappointments)

So, please, wait for me, i'm coming soon !

Cheers

Jean

Azogue is my surname because I am, among other perversions, an expert of mercury mines)
avatar Re: Dolomite
April 09, 2011 10:54AM
Azogue,

I will look forward to the day when you can more fully participate with is in building this site. You will be welcome.

Rock Currier
Crystals not pistols.
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