chlorargyrite


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chlorargyrite

[klȯr′ar·jə‚rīt]
(mineralogy)
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Name Crystal <hkl> Color system Chlorargyrite Cubic <002> Green Silver oxide Cubic <111> Red <002> Sodium sulfide Cubic <022> Orange Sulfur helical Hexagonal <110> Black Ice Tetragonal <021> Blue Halite Cubic <002> Wine Aluminium trihydroxide Monoclinic <200> Violet Potassium Cubic <001> Plum <111> Silver Cubic <002> Black <022> <113> % Name 0.1 ml 0.4 ml 0.4ml Dried at 40[degrees]C Dried at 100[degrees]C Chlorargyrite 2.1 3.2 Silver oxide 0.3 3.7 Sodium sulfide 14.6 12.2 Sulfur helical 15.2 26.1 Ice 36.3 21.4 Halite 11.0 10.8 Aluminium trihydroxide 2.2 2.1 Potassium 2.1 2.5 Silver -- -- 42.3 Values are obtained by Rietveld analysis.
Yellowish, minute (0.1 -mm) scaly bismutite and bismoclite crystals occur as an early constituent in some vugs with chlorargyrite, arsentsumebite and wulfenite, at the Reward mine.
Probably the very richest outcroppings or near-surface deposits worked by the Spaniards consisted of highly oxidized, brownish or reddish gossans (such as the "dark red" ledges of Potosi) suf fused with chlorargyrite. Potosi Mountain was well oxidized to a depth of 1,000 feel below the summit (Bakewell, 1984).
Silver mineralization within the vein shows strong secondary enrichment; ore minerals grade from chlorargyrite and silver at the top of the vein to pyrargyrite at depth.
Small, pale greenish to pale yellowish cuboctahedral crystals of chlorargyrite under 2 mm have sometimes been found in the Dolores prospect, perched on druses of microcrystals of arseniosiderite, jarosite, conichalcite and pharmacosiderite.
There was also a small but relatively important oxidation zone at the Silver Bow mine, and chlorargyrite was unusually abundant in the ores for a time.
Bromargyrite is relatively rare, occurring as translucent to opaque, colorless to grayish white crusts, and as aggregates of cuboctahedral crystals up to 1 mm, characteristically associated with chlorargyrite. Electron microprobe analysis of the bromargyrite indicates relatively high Cl content due to intergrowth with chlorargyrite (Szakdll and Kovacs, 1995).
Of special interest were two cases of "rarities" from Colorado; it is indeed rare, and of course educational, to see fine Colorado specimens of, for example, allanite, bismuthinite, chrysoberyl, chlorargyrite, and phosgenite.
Other associations include calcite, galena, anglesite, cerussite, sulfur, chlorargyrite, smithsonite and willemite.
Jordi says that microcrystalline chlorargyrite is interspersed also, helping, we hope, to hold these lacy little structures together.
Production continued through 1572, yielding native silver and chlorargyrite ore containing 25% silver.
The complex assemblage, currently under study at the Joanneum, includes pearceite, tiny green spherules of chlorargyrite, and tetrahedrite-tennantite.