Hemimorphite
Formula:Zn4Si2O7(OH)2 · H2O
Colour:Colorless, white, pale blue, pale green, gray, brown
Classification:Silicates
Lustre:Sub-Adamantine, Vitreous, Sub-Vitreous, Greasy, Silky, Pearly
Crystal System:Orthorhombic
Hardness:4.5-5
Specific Gravity:3.475