Mineralpedia Details for 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 

WebMineral

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Mindat

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Minute adamantine orange Xanthoconite crystals to 1mm.