Formula: (NH4)HCO3
Origin of name: for Frederick Edward Teschemacher (1761-1863), English chemist who first described the mineral.
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 7.255, b = 10.709, c = 8.746
Colour: Colourless, white, yellowish
Diaphaneity: Transparent
Luster: Vitreous
Habit: Massive, compact crystalline
Hardness: 1.5
Specific gravity: 1.58
Cleavage: 1; {110} perfect
Tenacity: Brittle fracture
Streak: White
Synonyms/varieties:
Comments: Soluble in water, decomposes in humid air
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