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Pargasite
Pargasite

Hibonite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
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3.04-3.26
Splintery, Uneven
{110} perfect
5-6
NaCa 2(Mg 4Al)Si 6Al 2O 22(OH) 2Michael O’Donoghue , Gems, Sixth Edition (2006)
 
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3.84
Subconchoidal, Conchoidal
{0001} good, {10 1 0} parting
7.5-8
(Ca,Ce)(Al,Ti,Mg)12O19