Formula: KCu3(SO4)2OCl
Origin of name: After locality; Tabalchik volcano, Kamchatka, Russia
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell: a = 9.741, b = 12.858, c = 7.001
Colour: Greenish-yellowish brown
Diaphaneity: Transparent
Luster: Vitreous
Habit: Rod-like crystals to 3 mm long, rectangular or rhombic cross section
Hardness: 3.5
Specific gravity: 3.48
Cleavage: 2; {011}, {100} perfect
Tenacity:
Streak: Yellow
Synonyms/varieties:
Comments: Soluble in water and weak acid solutions; hydrates and decomposes in air in a few weeks
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