You Are Here : Home / Explore/ Natural heritage / Adrian Smith Mineral Collection / Minerals, gems and meteorites / 268-402 Silicates / Crystaline

339. Tourmaline. Crystaline

View in new window

Dana number

61.3.1.10

Chemical formula

NaFe₃²⁺Al₆(BO₃)₃Si₆O₁₈(OH)₃(OH)

Crystal class

Hexagonal

Mohs hardness

7.5

Specific gravity

3.13

Collected in

Unknown, Unknown

Back to top