Formula: (Pb,Ca)3Sb2O8
Origin of name: From Greek for stable
Crystal system: Cubic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Yellow, orange-yellow, grayish green, dark brown
Diaphaneity: Translucent to opaque
Luster: Greasy to adamantine
Habit: Crystals octahedral, rarely cubic
Hardness: 4.5 to 6
Specific gravity: 5.94 to 7.29
Cleavage: 1; {111} indistinct
Tenacity:
Streak: Pale yellow to reddish brown
Synonyms/varieties:
Comments:
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