Formula: KHSO4
Origin of name: For G. Mercalli, Italian volcanologist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Colourless, sky-blue
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals tabular, minute, form stalactites
Hardness:
Specific gravity: 2.32
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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