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Umbalite
Umbalite
☒

Prase
Prase
☒



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Umbalite
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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

Fracture

Cleavage

Mohs Hardness

Chemical Composition

 
-
-
-
3.62-4.33
Uneven
Indiscernible
7-7.5
Mg 3Al 2(SiO 4) 3 -Mn2+3Al 2(SiO 4) 3Gemdat.org , Management Team (2012)
 
-
-
-
2.64-2.69
-
None
7
SiO 2Michael O’Donoghue , Gems, Sixth Edition (2006)

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