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Nepheline
Nepheline

Chromite
Chromite



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Nepheline
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Chromite
Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.55-2.65
Subconchoidal, Conchoidal
[1010] Poor
5-6
Na 3(Na,K)Al 4Si 4O 16Ulrich Henn and Claudio C.
 
Brittle
-
-
4.5-4.8
Uneven
None, parting may develop along {111}
5.5
Fe++Cr2O4