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Mineralpedia Details for Thaumasite

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Thaumasite

Thaumasite

Formula
Ca3Si(OH)6(SO4)(CO3)ยท12H2
Crystal System
Hexagonal 
Crystal Habit
Radial, Massive - Fibrous, Fibrous 
Cleavage
Poor, None, None 
Luster
Vitreous - Silky 
Color
colorless, white 
Streak
white 
Class
Hexagonal - Dipyramidal 
Fracture
Brittle - Conchoidal 
Hardness
3.5 
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Thaumasite from Crestmore, Riverside Co., California, United States

Thaumasite
            from Crestmore, Riverside Co., California, United States

Pearly white fibrous crystals in a 1.5cm long group on Merwinite matrix.

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