Tourmaline gained recognition in Europe in the 1700s. Its multicolor varieties, like watermelon tourmaline, make it one of the most versatile and adored gemstones.
Country of Origin
Brazil, Afghanistan, Madagascar, USA
Color(s)
Bi-color, multi-color, green, pink, blue, and black
Chemical Formula
(Na,Ca)(Al,Fe,Li,Mg,Mn)₃Al₆(BO₃)₃Si₆O₁₈(OH,F)₄
Hardness
7.5
Luster
Vitreous (Glassy)
Crystal System
Trigonal (Rhombohedral)
Refractive Index
1.61
Specific Gravity
3
Help Guide
Crystal System
Gemstones and minerals are classified into seven primary crystal systems based on their atomic structure.
Refractive Index
The refractive index (RI) of a material measure how much light is bent, or refracted, when entering the material from another medium.
Specific Gravity
The specific gravity (SG) of a substance is a measure of its density compared to water.
Chemical Formula
A chemical formula shows the types and quantities of atoms in a molecule.
