 | | Journal (article/letter/editorial) | | cattle on Trinidad Carrilloâs Mesteño Ranch in Chihuahua, Mexico. Little did he know that he had just discovered...of the worldâs greatest geode deposits. The Las Choyas Geode Deposit Downloaded by [Florida International...International University] at 20:00 23 August 2013 Chihuahua Mexico Figure 1. Quartz with an outstanding calcite... Figure 2. A view of the southern end of the Las Choyas geode deposit. The Carrillo mining camp can be...the Carrillosâ shop, which was brimming with Las Choyas geodes. When asked where the geodes came from |  | | Journal (issue) | | Micro Minerals of the Las Choyas Geodes, Aldama Municipality, Chihuahua, Mexico By Beth Heesacker My...that I invited to vend at our show brought these Las Choyas geodes, among others, to the show along with...Kaolinite can Mordenite Opal Pyrolusite Quartz var. Agate var. Amethyst var. Chalcedony Ramsdellite RanciĂ©ite |  | | Journal (article/letter/editorial) | | 1223â1244 A re-examination of water in agate and its bearing on the agate genesis enigma TERRY MOXON 55 Common...atmospheric water vapour pressure conditions. After agate acclimatization at 20°C and 46% relative humidity...problems have consequences for water quantification in agate and chalcedony using infrared or thermogravimetric...thermogravimetric techniques. Mobile and total water in agate is considered in relation to host-rock age, mogĂĄnite...contents allowing comment on quartz development and agate genesis. The water data also supports previous claims |  | | Journal (issue) | | particularly from the huge silver deposits of Mexico and eru. panish silver mining remade the economy...Record, E Figure 3. Montezuma, the ruler of Mexico-Tenochtitlan, is said to have observed a blazing...forced labor, cobbing out silver ore at a mine in Chihuahua; from Louis Simonin s i e ergr u r i e a i er...mita mestizo E W Figure 18. Indian miners in Mexico, from Louis Simonin s i e ergr u r i e a i er (1869)... Figure 20. An engraving of the School of Mines in Mexico City, opened in 1795, from Calderon de la Barca |  | | | | Crystallite growth kinetics in nanocrystalline quartz (agate and chalcedony) T. MOXON1,* 1 2 AND M. A. CARPENTER2...2009] ABSTR ACT Crystallite growth in natural agate samples has been investigated at temperatures of...at 550ÂșC. Limited growth was obtained when small agate cubes were heated in an open furnace up to 122 d...crystallite growth rate law does not describe natural agate growth quantitatively but a qualitatively similar...similar pattern is observed. K EY WORDS : agate, chalcedony, moganite, crystallite growth, XRD, Zener pinning |  | | Journal (article/letter/editorial) | | chalcedony rind (agate) than seen in figure 2, lined with smoky quartz crystals, from the Las Choyas geode deposit...deposit, Chihuahua, Mexico (Smith 2010). John Rakovan specimen and photo. barite, celestite [sic], and...These igneous geodes (fig. 3), which are common in Mexico, Brazil, Uruguay, and other countries, are essentially...Minerals 82:200â208. âââ. 2010. The Las Choyas geode deposit, Chihuahua, Mexico. Rocks & Minerals 85:112â23. |  | | Journal (article/letter/editorial) | | Nevada, 514 Agarditeâ(Y), Nevada, 515 Agate (fire), Arizona, 22 Agate, Turkey, 128â32 Agates from Western...Robinson, S. Aurichalcite, Nevada, 515 Australia, agate, 66â72 Azurite, Nevada, 516; Quebec, 500 B Babalik...California, 20 Bernstein, M., 444â45 Beryl, New Mexico, 21; Utah, 21 Beudantite, Nevada, 516 Biotite,...Gemstones, Canadian, 24â43; U.S., 14â23 Geodes, Mexico, 112â22 Georgia, meteorite, 475â76 Gnidovec, D...Nifontovite Specimens from Charcas, San Luis PotosĂ, Mexico, 165â69 K Kampf, A. R., New Apatite Nomenclature |  | | Journal (article/letter/editorial) | | Vol. 71(4), pp. 461â476 Metamorphic effects on agate found near the Shap granite, Cumbria, England: as...and Western Australian agates demonstrate that an agate or chalcedony infill can be used to identify post-deposition...palaeoheating within a host rock. K EY WORDS : agate, chalcedony, moganite, IR, Raman, XRD, cathodoluminescence...ïŹbrous texture under the polarizing microscope. Agate is banded chalcedony that is sometimes formed as...control, are only found in a limited number of agate regions. Agates are deposited world-wide within |  | | Calendar | | AGATES â L. January Januar Janvier Gennaio 2010 Agate. Mt. Hay, Queensland/Australia. Height 9,7 cm. Coll...February Februar Fevrier Febbraio ' If 2010 Agate, Mexico. Height 9 cm. Coll. Dietrich Mayer. Photo ©...3 4 5 6 â Marz Mars Marzo 8 910111213 2010 Agate. Aouli, Morocco. Height 9 cm. Coll. Dietrich Mayer...>\V â . .: : April April Avril Aprile 2010 J Agate. Kentucky, USA. Height 8 cm. Coll. Gabriele Berndt... 2010 Mai Mai Maggio 3 4 5 6 7 8 9 10 11 12 Agate. Mt. Hay, Queensland, Australia. Height 12 cm. Coll |  | | Journal (article/letter/editorial) | | and genesis of horizontal banding in Brazilian agate: an X-ray diffraction, thermogravimetric and electron...banded and wall-lining agate, a silica inïŹll seals the gap between the agate and the cavity wall. The...opal-CT ? opal-C ? chalcedony pathway. K EY WORDS : agate, chalcedony, mogaÌnite, cristobalite, horizontal...varieties in which the colour is fairly uniform and agate, in which the colour is arranged in bands (Deer...2013 The Mineralogical Society In some cases, agate contains a small amount of co-deposited calcite |  | | Journal (article/letter/editorial) | | minerals Review Agate Genesis: A Continuing Enigma Terry Moxon 1 and Galina Palyanova 2,3, * 1 2 3 ...discussions based on observations on host rock and agate thick sections. Over the next 25 years, experimental...identifying the physical and chemical properties of agate. The outcome of this work has allowed limited evidence-based...evidence-based comment on the conditions of agate formation. There is a general consensus that agates...Keywords: agate; chalcedony; XRD; genesis; moganite; crystallite growth; age 1. Introduction Agate and chalcedony |  | | Journal (issue) | | at rckhnd4252@gmail.com. 2018 Crawford Fairburn Agate Field Trip Report Brian Walko, Field Trip Leader...went hunting for the elusive Fairburn agate in the famous Agate Beds of northwestern Nebraska. We also...microcrystalline quartz family (prairie agate, picture agate, chert, jasper, and chalcedony) and petrified...petrified wood. Unlike last yearâs trip that tested the agate hunters against freezing rain and wind, this year...temperatures into the low 90s. DGMG Members in Agate Beds The first part of the field trip was scouting |  | | Journal (issue) | | forth seeking something surprising, the biggest agate, the oldest gem in the sand. Ken was a man who found...abaris2007@gmail.com; Web site: www.vgms.org 6-9âDEMING, NEW MEXICO: Retail show; Deming Gem & Mineral Society; SWNM...legrandite âballâ to the U.S. mineral market from Mexico. It is now in the Evan Jones collection. here...quantities of gorgeous adamite from Mapimi (Durango), Mexico, to Tucson. BOTTOM LEFT: Fennâs Minerals is the...shows in Tucson and Denver. Benny was born in Mexico of American parents over 70 years ago. His grandfather |  | | Journal (issue) | | Serving the World Since 1955 #70-545 Book Dryhead Agate by John Hurst Autographed Copy! Special $28.45 each...Symposium from page 13 TOP: Fine minerals of Mexico will be the subject of Dr. Pete Megawâs talk at...in-depth lecture on the now-famous Milpillas mine in Mexico, a modern bonanza deposit of azurite and malachite...deposits. Dr. Peter Megaw will carry on the subject of Mexico as he describes some of that countryâs great mineral...emeralds, sunstone in Oregon, peridot and fire agate in Arizona. I used to go to the Tucson gem show |  | | Journal (issue) | | are a large part of the displays at the Minnesota Agate and Geological Interpretive Center in Moose Lake...cut much more easily on the diamond wheels than agate. For this reason, I avoid using the 80-grit wheel...Unschooled in ered any smooth, shiny stone an agate. If we were lucky, it would contain some kind of...changed when my wife and I stopped at the Minnesota Agate and Geological Interpretive Center in Moose Lake...rocks, my friends and I consid- This Lake Superior agate has many fine lines in it. The reddish color comes |  | | Journal (issue) | | EARTHâS TREASURES âą MINERALS AND JEWELRY THE 2016 AGATE EXPO A Silica Extravaganza! R&G KIDS Stromatolite...FeaTures Virtually every form of agate will be represented at the 2016 Agate Expo in Cedarburg, Wisconsin...Wisconsin, including Laguna agate from Mexico. This specimen exhibits eye-catching shades of red, pink and yellow...by Bob Jones The 2016 Agate Expo ................................. 26 an agate loverâs dream FIelD TrIP...Editor Rockhound Dog While I collected beach agate, jasper, and petrified wood in Newport Beach, Oregon |  | | Journal (issue) | | BEST OF 2014 âą FIELD TRIPS: New Mexico Orbicular Granite Purple Agate from Arizona âą COLLECTING FOSSILS...MINERALS AND JEWELRY Laguna agate from Mexico is just one of the many types of agate that will be represented...represented at the 2016 Agate Expo in Cedarburg, Wisconsin. The silica gem is a rockhound favorite. (Steve Wheeler............. 18 Persistence pays off at this New Mexico site by Robert Beard Rock Science ......................................... 44 Pulga jade, New Mexico rockhound symbols, Dinosaur Diamond crostic Ethiopiaâs |  | | Journal (issue) | | Loire, Frankreich 47-51 Die Knack-Geoden von Las Choyas, Mexiko * * * STEIN 33(3), 09.06 (Noors)...gecompileerd, zie o.a. http://csd.unl. edu/agates/agate pageintro.asp# Het woord âagaatâ komt trouwens van |  | | Book (chapter) | | quartz-mogĂĄnite mixed-layer, LĂĄszlĂł 1 (1995). lace agate = blue + white banded quartz-mogĂĄnite mixed-layer...salt = halite, Egleston 147 (1892). Lake Superior agate = thomsonite-Ca or banded quartz-mogĂĄnite mixedlayer...Webster & Anderson 957 (1983). Lake Superior fire agate = glass (imitation opal), LĂĄszlĂł 1 (1995). Lake...moschellandsbergite, MM 27, 271 (1946). landscape agate = banded quartz-mogĂĄnite mixed-layer + pyrolusite...= transparent quartz, O'Donoghue 505 (2006). Las Choyas geodes = banded quartz-mogĂĄnite mixed-layer, |  | | Journal (issue) | | Editor Moose Lake Mistakes Lake Superior eye agate PAMELA HECHT PHOTO PAMELA HECHT PHOTO I received...picture in the middle of the same page labeled âeye agateâ, is also misidentified. This looks like the top...geologist to identify the eye agate. He said, âI think itâs an eye agate.â With that less-than-positive...Rockhound Roundup Gem & Mineral show in Deming, New Mexico. People were always posting pictures of and talking...nice stones that were brought to the show from Mexico. I am learning that if you want to get the best |  | | Journal (issue) | | Triangles FIELD TRIP: Orbicular Granite in New Mexico âTriassic Parkâ Fossils in Arizona www.rockngem...Granite........ 26 Persistence pays off at this New Mexico site by Robert Beard by James A. Miller Rock...com 14-16âPORTLAND, OREGON: Annual show; Oregon Agate & Mineral Society; OMSI; 1945 SE Water Ave.; Fri...found in a deep cavern in the Naica mine (Chihuahua, Mexico). These amazing crystals are up to 40 feet...2011 to interview him about another one of his agate claims and was given an opportunity to check out |  | | Journal (issue) | | Kliegerâs mystery agate, which is pictured in the September 2013 article âBlackfoot Canyon Agate and Jasperâ...suggests some sort of crystal structure, which agate simply does not have. What has happened is that...out, cracked, and formed the sharp ridges. Later, agate filled in the voids, and what you have is a negative...void, and then took on the same features as the agate specimens. âSteve Ewens via e-mail Steve Ewens...clams, pentacrinites, moss, algae, elkhorn coral, agate, geodes, lava, wonderstone, opal, obsidian, coprolite |  | | Journal (issue) | | Green-Luminescing Hyalite Opal from Zacatecas, Mexico By Emmanuel Fritsch, Peter K. M. Megaw, Tyler L...this rough and cut hyalite opal from Zacatecas, Mexico, is due to its green daylight-induced fluorescence... 532 Conferences Sinkankas Opal Symposium|AGA Las Vegas|Mallorca GemQuest| Scottish Gemmological Association|Swiss...Spectrometer In late May 2015, at the JCK jewellery show in Las Vegas, Nevada, USA, M&A Gemological In- struments...and covers a unique subtopic related to jasper, agate, or silica. Dr Campos-Venuti starting posting the |  | | Journal (issue) | | rough petrified wood, geodes and agate. âThis finished Crater agate is a good example. I purchased this...at the 2013 Tucson Show. Luis discovered Crater agate in 1997. I had no idea what might be hidden inside...polishing the three surfaces as one would do for any agate. The intersection lines and center point area are...when I was underground in the Naica mine in Chihuahua, Mexico, where huge selenite crystals are found. The...a beautiful fist-size chunk of agate. Of course, we didnât know agate from a turnip sandwich at the time |  | | Journal (issue) | | R&G Kids Agate Facebook Groups for Rock Clubs FIELD TRIP: Mulligan Peak (AZ) Purple Agate Collecting...interest by Denise M. Harrison Mulligan Peak Purple Agate ......................38 Chalcedony beds in Southeast...demonstrations, hourly door prizes, museum-quality agate displays; contact Tom Kottyan, (419) 562-1152; Web...process could be developed. Such was also the case in Mexico, where the Spanish worked many silver mines during...the silver was released. When de Medina came to Mexico in the 1550s, he applied this technique to silver |
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Las Choyas, Aldama Municipality, Chihuahua, Mexico