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Mineralpedia Details for Prehnite

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Prehnite

Prehnite

Formula
Ca2Al(Si3Al)O10(OH)2 
Crystal System
Orthorhombic 
Crystal Habit
Reniform, Globular, Stalactitic 
Cleavage
Distinct, None, None 
Luster
Vitreous - Pearly 
Color
colorless, gray, yellow, yellow green, white 
Streak
colorless 
Class
Orthorhombic - Pyramidal 
Fracture
Brittle 
Hardness
6-6.5 
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Prehnite from O & G Woodbury Quarry, Litchfield Co., Connecticut, United States

Prehnite
            from O & G Woodbury Quarry, Litchfield Co., Connecticut, United States

Large specimen of light green, botryoidal habit Prehnite.

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Prehnite from La Combe de la Selle, Isère, Rhône-Alpes, France

Prehnite
            from La Combe de la Selle, Isère, Rhône-Alpes, France

Deep bottle green, glassy rounded crystals to 1cm.

Click thumbnail images for larger view.

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