Formula: Ag3CuS2
Origin of name: Locality; Jalpa, Mexico
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 8.66 Ǻ, c = 11.74 Ǻ
Colour: Gray when fresh, tarnishes dark gray or iridescent with yellow
Diaphaneity: Opaque
Luster: Metallic
Habit: Massive, foliated or irregular granular
Hardness: 2 to 2.5
Specific gravity: 6.82
Cleavage: 1; prismatic good
Tenacity: Sectile
Streak: Black
Synonyms/varieties:
Comments:
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