Mineral - Ruby Zoisite

Name Ruby Zoisite
Class Silicates
Category Metamorphic mineral
Crystal system Orthorhombic (Zoisite) + Trigonal (Ruby)
Chemical composition Ca₂Al₃(SiO₄)(Si₂O₇)O(OH) (Zoisite) with corundum inclusions (Al₂O₃ – Ruby)
Hardness (Mohs scale) 6 to 7 (depending on the ruby proportion)
Transparency Opaque to translucent
Geographical origin Tanzania, India