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Mineralpedia Details for Glaucophane

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Glaucophane

Glaucophane

Formula
[box]Na2(Mg3Al2)Si8O22(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Massive - Fibrous, Columnar, Granular 
Cleavage
Good, Good, None 
Luster
Vitreous - Pearly 
Color
gray, bluish black, lavender blue, azure blue 
Streak
grayish blue 
Class
Monoclinic - Prismatic 
Fracture
Brittle - Conchoidal 
Hardness
6-6.5 
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Glaucophane from San Benito Co., California, United States

Glaucophane
            from San Benito Co., California, United States

Bluish black splintery and bladed crystals to 2cm in a tight packed aggregate.

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Glaucophane from Russian River, Cloverdale, Mendocino Co., California, United States

Glaucophane
            from Russian River, Cloverdale, Mendocino Co., California, United States

Glaucophane prismatic crystals to 1cm or more at random orientations about matrix. 

Click thumbnail images for larger view.

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