Miargyrite

Formula:  AgSbS2

Origin of name:  From Greek for less and silver

 

Crystal system:  Monoclinic

Crystal class:  m

Twinning: 

Unit cell: a = 13.22 Å, b = 4.41 Å, c = 12.88 Å, β = 98.8°

 

Colour:  Steel-gray to iron-black

Diaphaneity: 

Luster:  Metallic adamantine

Habit:  Crystals thick tabular, may be complex, often deeply striated; massive

Hardness:  2.5

Specific gravity:  5.25

Cleavage:  3; {010} imperfect, {100} and {101} trace

Tenacity:  Subconchoidal to uneven; brittle

Streak:  Red

 

Synonyms/varieties:

 

Comments: 

 

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