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Acanthite
Acanthite is a modification of Silver Sulphide at low temperature and its present in almost all silver deposits, presents a high silver content in its usual absence of prismatic habit, good crystals are rare, usually found maassive or as branches, can be associated with silver, quartz, bornite, gold, galena, proustite, pyrargyrite, stephanite

Physical Characteristics

 

Color: Lead Grey, Black
Luster: Metallic
Transparency: Opaque
Crystal System: Monoclinic
Habits: Usually forms coatings or arborescent branches, rarely forms crystals
Fracture: Conchoideal
Cleavage: Abcent
Hardness: 2.0 - 3.0
Specific Gravity: 5.5 - 5.8
Streak: Lead gray - shiny black
Other: Sectile (can be cut with a knife)
Occurrence: Mexico (Guanajuato, Zacatecas, Chihuahua and Sonora).
Czech Republic, Germany, USA, Canada, Chile