Hemimorphite
Chemical Formula	Zn4Si2O7(OH)2·H2O
Species	Silicates
Crystal System	Orthorhombic
Mohs Scale	4-5
Specific Gravity	3.516-3.525
Color	White, blue, greenish
Streak	White
Luster	Adamantine, Vitreous, Silky, Pearly
Refractive Index	n = 1.614 n = 1.617 n = 1.636
Diaphaneity	Transparent, Translucent
Cleavage	PerfectPerfect on , poor on , rare
Fracture	Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Polar crystals, with different or hemimorphic ends. Also coxcomb masses, mammillary, stalactitic, or massive
Geological Setting：Secondary mineral in the weathered portions of zinc deposits.