Merelani hills of Tanzania

Sensationelle Matrixstufe

I don't think I've ever seen as rich a blue in a zoisite as this 10 cm specimen on matrix from the Merelani hills of Tanzania

Formula: Ca₂Al₃(Si₂O₇)(SiO₄)O(OH)

System: Orthorhombic

Colour:  purple, ...

Lustre: Vitreous

Hardness: 6 – 7

Photo : © Malte Sickinger