Zoisite
ID: 115
Zoisite
Chemical Formula
Ca2Al3(SiO4)3(OH)
Hardness (Mohs)
6-7
Crystal System
Orthorhombic
Streak
White
Luster
Vitreous
Diaphaneity
Transparent to opaque
Color
Grey, green, pink, brown, blue (tanzanite variety)
Crystal Habit / Mode of Occurrence
Prismatic, typically striated crystals; massive, columnar, granular
Fun Facts
Zoisite is the parent mineral for the well-known gemstone Tanzanite.