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Tourmaline

Tourmaline is a beautiful borosilicate gem found in various colors that exhibits a transparent to translucent, vitreous luster. It is primarily a New World stone, but derives its name from Tamil because it is also mined in Sri Lanka. It has a complex molecular organization and, because of its many varieties, cannot be described by any one formula.

Chemical Formula

(Ca,K,Na,[])(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6(BO3)3(Si,Al,B)6O18(OH,F)4

BirthStone Month

October

Gemstone Mineral

Tourmaline

Crystal Structure

Trigonal

Hardness

7.00 - 7.50

Specific Gravity

3.030 - 3.250

Double Refraction

1.603

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