Paradocrasite

Formula: Sb2(Sb,As)2

Origin of name: from Greek paradoxos = unusual and krasis = alloy

 

Crystal system: monoclinic

Crystal class: 2

Twinning: 

Unit cell: 

 

Colour: brilliant silver-white

Diaphaneity: opaque

Luster: metallic

Habit: crystals stubby prismatic, sometimes striated parallel to elongation, to 0.5 mm, grooved hexagonal plates

Hardness: 3

Specific gravity: 6.52

Cleavage: 3; {010} parting, perfect, other less perfect partings

Tenacity: 

Streak: black

 

Synonyms/varieties:

 

Comments: 

 

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