Formula: ZnCO3
Origin of name: for J. Smithson, English chemist who endowed the museum
Crystal system: hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 4.65 Å, c = 15.03 Å
Colour: white, grayish, yellow, yellowish brown to brown, green, bluish
Diaphaneity:
Luster: vitreous to pearly
Habit: crystals rhombohedral, often curved and rough, crusts, botryoidal, stalactitic, reniform, massive, granular to compact
Hardness: 4 to 4.5
Specific gravity: 4.30 to 4.45
Cleavage: 1; {10-11} nearly perfect
Tenacity: subconchoidal to uneven, brittle
Streak: white
Synonyms/varieties:
Comments:
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