Tourmaline Gemstone - تورمالی | ترمری

Specific Gravity ~ 3.10

Hardness ~ 7.25 on Mohs scale

Refractive Index ~ 1.65

Silica 30%

Alumina 38%

Magnesium 10%

Calcium 9%

Iron 5%

Beryllium 12%

Chrome 1%

Capricorn, Aquarius/Saturn