Formula: (Ag,Tl)2Pb8Sb8S21
Origin of name: for Santosh Ray, Indian petrologist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: gray
Diaphaneity: opaque
Luster: metallic
Habit: tabular grains, 30 micron, 0.5 mm patches
Hardness:
Specific gravity: 6.13
Cleavage: none
Tenacity:
Streak: lead-gray
Synonyms/varieties:
Comments:
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