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Oligoclase
Oligoclase
☒

Peridot
Peridot
☒



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Oligoclase
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
2.62-2.67
Uneven
From the Greek, oligos and kasein, little cleavage.
6-6.5
Na(90-70%)Ca(10-30%)(Al,Si)AlSi 2O 8Michael O’Donoghue , Gems, Sixth Edition (2006)
 
-
-
-
1.54-1.55
Conchoidal
Poor
6.5-7
(Mg,Fe)2SiO4

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