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Kyanite
Kyanite

Narsarsukite
Narsarsukite



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Kyanite
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Narsarsukite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
Brittle
-
-
3.53-3.65
Splintery
[100] perfect [010] imperfect with 79° angle between
4-7
Al2SiO5
 
Brittle
-
-
2.72-2.83
Uneven
Good on {100} and {110}
6-7
Na 2(Ti,Fe)Si 4(O,F) 11Ulrich Henn and Claudio C.