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Topic: Tetrahedrite

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	Fahlerz and Arsenic-bearing
		Tetrahedrite group minerals are economically important, as copper ores and are the world's most important primary source of silver.
		Tetrahedrite is often found as a replacement of earlier formed sulphides or sulphosalts, due to the reaction of minerals such as sphalerite and chalcopyrite with later As and Sb (Cu)-bearing hydrothermal fluids.
		Tetrahedrite group minerals are ubiquitous in polymetallic veins and skarns formed by hydrothermal activity associated with high level intermediate or acid igneous rocks - especially in the meso- and epithermal deposits of the western Americas related to Andean (the Cordilleran Veins) and Laramide orogenesis.
	www.rosiehardman.com /fahlerz.htm (7179 words)

	Tetrahedrite, the silver-carrier in Central Wales
		Tetrahedrite (L) forming distinctive, grey-brown triple-grain contact inclusions in recrystallised galena with chalcopyrite and a little white ullmannite.
		The sample is from Cwmerfin mine, one of a notable group of mines between Darren and Goginan where very high silver yields (30 ounces/ton) in lead-ore were par for the course.
		Tetrahedrite also occurs in hand specimens as 2-3cm aggregates and its presence must have been known about in the 17th century - these were silver mines back then.
	www.geologywales.co.uk /tetrahedrite.htm (157 words)

	XPS Characterization of Chalcopyrite, Tetrahedrite, and Tennantite Surface Products after Different Conditioning. 1. ... (Site not responding. Last check: 2007-10-25)
		In the case of tetrahedrite and tennantite the outermost hydrophilic layer consists mainly of copper oxides/hydroxides and it is not well separated from the rest of the surface structure.
		Tetrahedrite forms the copper oxides/hydroxides product much more quickly with a major amount of cupric species, whereas tennantite oxidation, under the same conditions, yields a small amount of cuprous surface species.
		It should be noted that although tetrahedrite and tennantite contain a significant amount of other elements, they are not concentrated in the outermost layer.
	pubs.acs.org /cgi-bin/abstract.cgi/langd5/1996/12/i10/abs/la9505881.html (346 words)

	Tetrahedrite (Site not responding. Last check: 2007-10-25)
		This sample of tetrahedrite is displayed in the Smithsonian Museum of Natural History.
		Tetrahedrite is an sulfide mineral of antimony, copper and iron with the composition (Cu,Fe)
		This sample of tetrahedrite is formed with calcite.
	hyperphysics.phy-astr.gsu.edu /hbase/minerals/tetrahedrite.html (58 words)

	[No title]
		The formation of Sb ores was followed by precipitation of dolomite and tetrahedrite and finally, by separate barite veins.
		Later tetrahedrite ores with sulphides richer in Bi were formed presumably from fluids with similar PT conditions.
		Tetrahedrite from several Sb veins is chemically close to tetrahedrite from Dubrava.
	www.fns.uniba.sk /prifuk/casopisy/geol/199953/chovan.txt (3364 words)

	TETRAHEDRITE (Copper Antimony Sulfide)
		Tetrahedrite is named for its common crystal form, the tetrahedron.
		Tetrahedrite is in an informal group of minerals called the "fahlerz" or "fahlores" group.
		Often it will contain a certain percentage of silver and be used as a minor ore. The multi-faceted tetrahedral crystals as well as the flat faced simple tetrahedral crystals can be very striking and a real pleasure for mineral collectors to own.
	mineral.galleries.com /minerals/sulfides/tetrahed/tetrahed.htm (400 words)

	Mining, Mineralization and Tax Evasion in the Channel Islands.
		This assemblage is common in the islands and if the tetrahedrite is argentiferous (as in Jersey and Sark) then this specimen may well represent one of the silver-lead lodes.
		The primary ore (collected from the tips on the north-eastern end of the lode) is composed of pyrite and quartz in a galena or, locally, chalcopyrite and tetrahedrite cement with subordinate amounts of marcasite and sphalerite.
		Silver is present in the antimony sulphosalts, polybasite, pyrargyrite and tetrahedrite (up to 23 wt % Ag) and to a lesser extent as the arsenic sulphosalts, pearceite and tennantite (up to 20wt % Ag).
	www.rosiehardman.com /taxev.htm (3441 words)

	DAWN R. ACKERMAN (Site not responding. Last check: 2007-10-25)
		Microprobe analyses of tetrahedrite from the Trixie mine, East Tintic District, Utah, a base and precious metal vein deposit, are used to characterize the chemical variation of the mineral tetrahedrite, refine ore genesis models, and relate solid solution compositions to variations in the physico-chemical conditions attending mineralization.
		This implies tetrahedrite composition is relatively insensitive to fO2 and pH when another solid solution mineral of similar composition is present because expansion of one stability field is restricted by expansion of the other stability field.
		Despite these rapid compositional variations there is a strong association of Ag- and Sb-rich tetrahedrite with the gold ore identifying the zone of mixing and maximum extent of fluid evolution in the Trixie mine.
	www.mines.utah.edu /~wmep/Petersenvit/students/ackerman.html (444 words)

	Payne Report
		The border of the vein is dominated by dolomite with patches of pyrite, lesser tetrahedrite, and minor chalcopyrite.
		One patch 1.5 mm across and several smaller, irregular patches are of tetrahedrite with minor to moderately abundant chalcopyrite.
		Tetrahedrite also forms a few patches up to 0.2 mm in size associated with dolomite in the quartz-rich part of the vein.
	www.vanpetro.com /payne_rep.htm (1248 words)

	CR-Scientific: Catalog: Mineral Specimens: Tetrahedrite w/ Quartz and Rhodochrosite - Peru
		Tetrahedrite with Quartz, Rhodochrosite, and Sphalerite - Casapalca, Peru.
		A good Sm.CAB specimen having abundant crystals of gray, metallic tetrahedrite with white aggregates of rhodochrosite and frosty white xtls of quartz.
		The tetrahedrite xtls are well-defined, although there is some minor erosion on some corners.
	www.crscientific.com /cr227-tetrahedrite.html (98 words)

	TETRAHEDRITE - LoveToKnow Article on TETRAHEDRITE (Site not responding. Last check: 2007-10-25)
		Tetrahedrite is an important ore of copper, the formula (uISbS,, corresponding with 57.5 per cent.
		they belong to the tetrahedral class of the cubic system, and their tetrahedral form is a very characteristic feature of the mineral, which for this reason was named tetrahedrite.
		Tetrahedrite occurs in metalliferous veins associated with chatcopyrite, pyrites, blende, galena, andc.
	www.1911ency.org /T/TE/TETRAHEDRITE.htm (811 words)

	Mineralogical Record: Pasto Bueno district, The
		Early-formed tetrahedrite is Sb-rich and gradually grades to Asrich tennantite, which is typical of late-stage mineralization.
		Hubnerite, tetrahedrite and pyrite dominate, with minor amounts of arsenopyrite, sphalerite, chalcopyrite, bornite, stibnite, polybasite, bournonite, covellite, galena, gold and rarely pyrrhotite.
		Tabular wolframite, As-rich tetrahedrite, and Fe-rich sphalerite came from the principal vein, the Veta Pueblo, which was being mined in 1974.
	www.findarticles.com /p/articles/mi_qa3672/is_199707/ai_n8759383 (1345 words)

	Tetrahedrite in Colorado
		A 3.7 x 3 cm specimen of tetrahedrite with a couple of crude irridescent bornite crystals.
		This cluster of tetrahedrite crystals, from the Sweet Home Mine, is accented by chalcopyrite.
		A tetrahedrite crystal perched on a thin plate of quartz.
	www.peaktopeak.com /colorado/mineral.php3?mineralid=99 (58 words)

	Rimfire Minerals Corporation - Thorn, BC - Fri Apr 7, 2006 (Site not responding. Last check: 2007-10-25)
		Rimfire geologists identified three main types of mineralization within the altered porphyry, as well as one style that occurs in the surrounding sediments and volcanics.
		Catto Vein: Discovered in 2000, the recessive Catto Vein consists of massive pyrite, enargite and tetrahedrite in a fault paralleling the nearby contact between the porphyry and older andesites.
		B Zone: The B Zone is a 1-5 metre wide zone of vuggy silica, chalcedonic veining and quartz breccia with relatively minor pyrite, enargite and tetrahedrite, which has been traced for about 300 metres along strike.
	www.rimfire.bc.ca /s/Thorn.asp (1814 words)

	Enlarged view of selected mineral (Site not responding. Last check: 2007-10-25)
		This handsome specimen of well formed tetrahedrite crystals are mounded up in a v-shaped specimen.
		The tetrahedrites are extra interesting in that most of them have a partial film of chalcopyrite on each that shimmers in the light.
		The tetrahedrite crystals show the tetrahedral form as dominant and modified by the dodecahedron.
	www.davidkjoyceminerals.com /htmfiles/enlarge.asp?ProdID=189 (75 words)

	tetrahedrite.htm (Site not responding. Last check: 2007-10-25)
		Description: Tetrahedrite forms a solid solution series with tennantite and freibergite in moderate to low temperature hydrothermal deposits.
		ONEIDA COUNTY: Tetrahedrite is found in the Lynne massive sulfide deposit, where it is associated with galena, sphalerite, chalcopyrite, gold and silver minerals.
		TAYLOR COUNTY: Tetrahedrite occurs at the Bend massive sulfide deposit NW, sec.
	www.uwrf.edu /~william.s.cordua/tetrahedrite.htm (147 words)

	SME--VIRTUAL ATLAS OF OPAQUE AND ORE MINERALS
		Subhedral tetrahedrite (green-grey, moderate reflectance, centre left, extreme bottom right) is pitted and is associated with euhedral quartz (dark grey, centre left).
		Altered euhedral tetrahedrite (light grey, left) is rimmed by chalcopyrite (yellow, centre).
		Galena, chalcopyrite, argentian tetrahedrite, bournonite and native antimony.
	www.smenet.org /opaque-ore/PLATE35.htm (396 words)

	XPS Characterization of Chalcopyrite, Tetrahedrite, and Tennantite Surface Products after Different Conditioning. 2. ... (Site not responding. Last check: 2007-10-25)
		The adsorbed amount of xanthate as well as the structure of the outermost layer, which is responsible for the mineral sample's hydrophobicity, varied dramatically.
		Tetrahedrite shows the fastest kinetics of xanthate adsorption with the formation of multilayer coverage of surface cuprous xanthate.
		On chalcopyrite and tennantite the adsorbed amount of xanthate is much lower, close to a monolayer coverage.
	pubs.acs.org /cgi-bin/abstract.cgi/langd5/1996/12/i10/abs/la950589t.html (336 words)

	Mineral description : Tetrahedrite (Site not responding. Last check: 2007-10-25)
		Sulphides : Tetrahedrite - Bournonite - Boulangerite group.
		Tetrahedrite and tennantite creates a continuous serie under the common name fahlerts.
		If you have some questions, suggestions or comments you are welcome to write me a line or two.
	www.geology.neab.net /minerals/tetrahed.htm (56 words)

	Tetrahedrite Mineral Data
		Comments: A very brilliant tetrahedrite group with the tops of the crystals covered in chalcopyrite.
		Comments: Bright sharp metallic tetrahedrite crystals to 1 cm in size on pinkish to colorless crystalline calcite matrix.
		Calculated Relative Intensity Colors of Tetrahedrite in Air
	webmineral.com /data/Tetrahedrite.shtml (234 words)

	SME--VIRTUAL ATLAS OF OPAQUE AND ORE MINERALS
		The galena carries small inclusions of tetrahedrite (grey, lower reflectance, centre right), which are difficult to see, and euhedral pyrite (centre right).
		Euhedral pyrite (light yellow-white, left) is intergrown with chalcopyrite (yellow, centre), galena (light blue-white, centre right) and tetrahedrite (green-blue, lower reflectance, harder than galena, centre right) and minor sphalerite (grey, centre top).
		Large sphalerite (grey) crystals are separated by intergrown chalcopyrite (yellow, centre), galena (white, centre) and tetrahedrite (green-blue, centre).
	www.smenet.org /opaque-ore/plate27.htm (421 words)

	Collector's Edge Minerals, Inc.: Browsing SWEET HOME MINE - Rhodochrosite (Site not responding. Last check: 2007-10-25)
		Sharp, orangish-pink rhombohedra (deeper pink under indandescent or halogen light!) associated with tetrahedrite and minor fluorite and quartz.
		These pink to medium red rhombohedra are partially coated by a low-temperature, pale pink rhodochrosite layer, which adds to the mineralogical story of the piece, as does the association of quartz, tetrahedrite, sphalerite and pyrite.
		This is a fine miniature cluster of sharp, orange-pink rhombohedra to 8mm on an edge, on and pierced by needlelike white quartz crystals.
	www.collectorsedge.com /acb/showprod.cfm?&DID=13&CATID=4&ObjectGroup_ID=6 (336 words)

	Crystal chemistry of tetrahedrite solid-solutions: EPR and magnetic investigations
		Abstract: One hundred and thirty samples from the collection of the Natural History Museum in Florence, labeled as tetrahedrite, have been extensively studied by means of SEM, XRD, EPMA, DTA, EPR and SQUID techniques.
		Wide-ranging substitutions, confirmed by compositional data, play a fundamental role in the thermal behavior, "stabilizing" natural tetrahedrite with respect to the synthetic equivalent.
		The results of the study confirm the crystal-chemical formula of the tetrahedrite samples investigated.
	pubs.nrc-cnrc.gc.ca /mineral/tcm-83740-3.html (476 words)

	Sweet Home Mine, Colorado Minerals - The Geode Gallery (Site not responding. Last check: 2007-10-25)
		This mine is well known throughout the world as a leader or the leader in fine rhodochrosite specimens.
		In addition to rhodochrosite, however, are several associated minerals, including quartz, fluorite, pyrite, chalcopyrite, tetrahedrite, huebnerite, and a few other less-common minerals.
		Several pyrite crystals to 1cm along with a tetrahedrite crystal of 1cm, and a small huebnerite blade, all on quartz covered matrix.
	www.geodegallery.com /colorado/sweethome.html (451 words)

	Rocks & Minerals: Bournonite: Yaogangxian Mine, Chenzhou, Hunan Province, China (Site not responding. Last check: 2007-10-25)
		It typically forms in hydrothermal vein systems at intermediate temperatures and is often associated with pyrite, galena, sphalerite, chalcopyrite, stibnite, boulangerite, zinkenite, tetrahedrite, carbonates, barite, and quartz.
		It occurred as silvery twinned crystals to 1 cm associated with tetrahedrite, arsenopyrite, and boulangerite at the large open-pit silver mine in the Candelaria district, Mineral County, and as excellent single and twinned crystals to 8 mm associated with andorite and enargite in quartz veins found at the Monitor mine, Taylor district, White Pine County.
		Good cogwheel twins to 5 cm across occur with tetrahedrite, pyrite, galena, sphalerite, and arsenopyrite in the Noche Buena mine, Mazapil, and from Conception del Oro, Zacatecas.
	www.findarticles.com /p/articles/mi_m0GDX/is_1_80/ai_n8694218 (1146 words)

	rhodoroom2
		Tetrahedrite accents this exceptional 7.5 cm by 9 cm plate.
		There appear to be some Bornite in association with the Tetrahedrite xls.
		Cute specimen of Rhodochrosite with Fluorite, Tetrahedrite, and Quartz!
	www.themineralgallery.com /rhodoroom2.htm (1012 words)

	Bob's Rock Shop: Nevada Collecting Sites
		TETRAHEDRITE: Some of the large, massive quartz boulders contain anhedral blobs of silvery-metallic tetrahedrite to 1cm.
		One specimen that I collected a couple of years ago has two euhedral tetrahedrons to 1mm in a quartz vug, but this is the only specimen that I have seen with actual crystals of this species.
		In the Fall of 1991-1992, I was told of this locality by a friend, for its "turquoise", but as soon as I saw the mine dumps I knew that this blue mineral was actually chrysocolla.
	www.rockhounds.com /rockshop/nvsites.html (2171 words)

	Bonding relationships in some ternary and quarternary phosphide and tetrahedrite structures: (Ag6M4P12)M6', ... (Site not responding. Last check: 2007-10-25)
		Electronic structure calculations are reported for three different, but structurally related, types of ternary or quaternary compounds that can be classified as derivatives of tetrahedral structures.
		It is shown that structurally there materials contain Ag octahedral clusters trapped in, and rather weakly coupled to, a closed network of covalent bonds.
		Among the tetrahedrite and tennantite family, compounds with chemical formulae such as Cu Sb
	stacks.iop.org /0022-3719/19/5837 (288 words)

	Mineral Specimens - Trinity Mineral Company
		This specimen is comprised of gemmy rhodo crystals set on crystalline tetrahedrite - some of which has been altered to chalcopyrite.
		The matirx consists of quartz, galena and tetrahedrite.
		This specimen of crystalline quartz and various sulfides (mostly tetrahedrite) hosts numerous dodecahedral crystals of violet colored fluorite and a single 0.5 cm crystal of rhodochrosite.
	www.trinityminerals.com /nam/swusa/swusa3.shtml (750 words)

	Acta Geologica Universitatis Comenianae Bratislava
		Chemical composition of tetrahedrite within Nízke Tatry Mts is not uniform.
		Tetrahedrite from several Sb veins is chemically close to tetrahedrite from Dúbrava.
		Fig.5 A - Chalcostibite (light grey) and metacrystals of pyrite replacing tetrahedrite (grey) along bands.
	www.fns.uniba.sk /prifuk/casopisy/geol/199953/chovan.htm (3204 words)

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