Zoisite
Chemical Formula	Ca2Al3(SiO4)(Si2O7)O(OH)
Species	Silicates
Crystal System	Orthorhombic
Mohs Scale	6-7
Specific Gravity	3.10-3.36
Color	White, gray, greenish brown, greenish gray, pink, blue, purple
Streak	White or colorless
Luster	Vitreous
Refractive Index	n = 1.696 - 1.700 n = 1.696 - 1.702 n = 1.702 - 1.718
Diaphaneity	Transparent, Translucent
Cleavage	PerfectPerfect on Imperfect on
Fracture	Irregular/Uneven, Conchoidal
Crystal Habit：Crystals flattened in an acicular manner, may be fibrously curved and striated. Massive to columnar
Geological Setting：Medium grade regionally metamorphosed rocks, eclogites, blueschist facies metamorphic rocks.