Mineral - Prehnite

Name Prehnite
Class Semi-precious
Category Phyllosilicate
Crystal system Orthorhombic
Chemical composition Calcium and aluminum silicate (Ca₂Al(AlSi₃O₁₀)(OH)₂)
Hardness (Mohs scale) 6 to 6.5
Transparency Translucent to transparent
Geographical origin South Africa, Australia, China, Scotland, United States, France