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Kyanite

#PD36312
SOLD
Kyanite from Cobble Mt. Reservoir, Blanford, Maryland, United States - PD36312
Kyanite from Cobble Mt. Reservoir, Blanford, Maryland, United States - PD36312

Kyanite

#PD36312
Availability
Sold
Size
13 x 12 x 5 cm - Cabinet 
Formula
Al2OSiO4 (RRUFF)
Locality
Cobble Mt. Reservoir, Blanford, Maryland, United States

This is a large cabinet specimen with several long bladed crystals. The longest blade measures12cm. It is somewhat more green than the characteristic blue of Kyanite, which derives it's name from "kyanos" Greek for blue. Geologist use kyanite as an index mineral, which will indicate metamorphic rocks subjected to high pressures. It is polymorphous with the other two temperature-pressure index minerals sillimanite and andalusite.

Kyanite

Formula
Al2OSiO4 
Crystal System
Triclinic 
Crystal Habit
Columnar, Fibrous 
Cleavage
Perfect, Imperfect, None 
Luster
Vitreous - Pearly 
Color
blue, white, gray, green, black 
Streak
white 
Class
Triclinic - Pinacoidal 
Fracture
Brittle 
Hardness
4-7 

Data courtesy of Webmineral.

Collection
Phillips Collection
Mineralpedia
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On Dakota Matrix
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On Dakota Matrix
Other Available Kyanite
WebMineral
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Mindat
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