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Taaffeite
Taaffeite

Rubellite
Rubellite



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Taaffeite
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Rubellite

Physical Properties

Tenacity

-
-

Solubility

-
-

Durability

-
-

Specific Gravity

3.60-3.613.01-3.06
1 7.18
👆🏻

Fracture

Conchoidal
Conchoidal

Cleavage

Imperfect/fair/absent
Indiscernible

Mohs Hardness

8-8.57-7.5
2 10
👆🏻

Chemical Composition

Mg 3Al 8BeO 16Walter Schumann , Gemstones of the world (2001) More from other references
Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) Formula given for elbaite.