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Mineralpedia Details for Xanthoconite

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Xanthoconite

Xanthoconite

Named for its streak color from the Greek xanthos, meaning “yellow,” and konis, meaning “powder.” It is found in several localities including the Czech Republic, Germany, Romania, France, Chile, Canada, Mexico, and the United States. Found in small amounts, Xanthoconite occurs as a mineral in hydrothermal veins associated with silver sulfosalts.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/xanthoconite.pdf

Formula
Ag3AsS3 
Crystal System
Monoclinic 
Crystal Habit
Massive - Granular, Reniform, Tabular 
Cleavage
Distinct, None, None 
Luster
Adamantine 
Color
dark crimson red, dark orange, brown, lemon yellow 
Streak
orange yellow 
Class
Monoclinic - Prismatic 
Fracture
Sub Conchoidal 
Hardness
2.5-3 
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Xanthoconite from Imiter mine, Anti-Atlas Mts., Dades Region, Morocco

Xanthoconite
            from Imiter mine, Anti-Atlas Mts., Dades Region, Morocco

Minute adamantine orange Xanthoconite crystals to 1mm.

Click thumbnail images for larger view.

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