Lautite

Formula:  CuAsS

Origin of name:  After locality; Lauta, Marienberg, Saxony, Germany

Crystal system:  Orthorhombic

Crystal class:  mm2

Twinning: 

Unit cell: 

Colour:  Black to steel-gray with reddish tint

Diaphaneity:  Opaque

Luster:  Metallic

Habit:  Crystals tabular or short prismatic; massive, compact to fine granular; radial groups; columnar to fibrous

Hardness:  3 to 3.5

Specific gravity:  4.9

Cleavage:  1; {001}

Tenacity: 

Streak: 

Synonyms/varieties:

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