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Umbalite
Umbalite
☒

Chalcedony
Chalcedony
☒



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Umbalite
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Chalcedony
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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)
 
-
Soluble
-
2.55-2.70
Uneven, Splintery, Conchoidal
Absent
6.5-7
SiO2

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