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Mineralpedia Details for Gonnardite

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Gonnardite

Gonnardite

Formula
(Na,Ca)2(Si,Al)5O10ยท3H2
Crystal System
Tetragonal 
Crystal Habit
Fibrous, Spherical 
Cleavage
Perfect, None, None 
Luster
Vitreous (Glassy) 
Color
white 
Streak
white 
Class
Tetragonal - Scalenohedral 
Hardness
4-5 
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Gonnardite from Moiliili quarry, Honolulu, Oahu Island, Honolulu Co., Hawaii

Gonnardite
            from Moiliili quarry, Honolulu, Oahu Island, Honolulu Co., Hawaii

White radial crystals. Ex. Rudy Tschernich.

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Gonnardite from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Gonnardite
            from Mont Saint-Hilaire, Rouville Co., Quebec, Canada

Tiny snow white square-tabular crystals with excellent coverage.

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