- a hydrous zinc silicate mineral, Zn4(OH)2Si2O7⋅H2O, occurring in clear, colorless orthorhombic crystals; calamine: an ore of zinc.
- a white mineral consisting of hydrated zinc silicate in orthorhombic crystalline form: a common ore of zinc. Formula: Zn 4 Si 2 O 7 (OH) 2 .H 2 O
