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Rubellite

rubellite
Rough rubellite from Madagascar

Members of the tourmaline family of minerals have the same basic crystal structure, but occur in many colors. Rubellite (from the Latin for red) is the name given to the pink or red variety, with ruby-red stones  the most highly prized. Rubellite crystals are striated, with a triangular cross-section and a rounded outline. They may also occur with a fibrous habit, and show a cat’s-eye when cut in cabochon.

Russian pink and red tourmaline occurs in weathered granites. Other sites include Madagascar, United States, Brazil, Burma, and East Africa.

The specific gravity of tourmaline varies with color dark red has a higher S.G. than pink.

Chemical Composition : Complex borosilicate
Crystal System / Forms :

Trigonal


Cuts & Uses :

Pendeloque, Step, Cabochon.


Hardness : 7.5
Lustre : Vitreous
Refractive Index / Birefringence :

1.62-1.64 / 0.018


Sources :

Madagascar, United States, Brazil, Burma and East Africa.


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