Mineral - Tourmaline Quartz

Name Tourmaline Quartz
Class Semi-precious
Category Quartz with black tourmaline (schorl) inclusions
Crystal system Hexagonal
Chemical composition Silicon dioxide (SiO₂) with complex borosilicate inclusions (tourmaline)
Hardness (Mohs scale) 7
Transparency Translucent to transparent
Geographical origin Brazil, India, Madagascar, United States, South Africa