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314. Tourmaline. Crystaline

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Dana number

61.3.1.8

Chemical formula

Na(Li_0.5Al_0.5)₃Al₆(BO₃)₃Si₆O₁₈(OH)₃(F)

Crystal class

Hexagonal

Mohs hardness

7.5

Specific gravity

3.05-3.10

Collected in

Unknown, Unknown

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