Hemimorphite

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Hemimorphite 
Frequency rare 
Hardness 4.5-5 
Density 3.5
Chemical Formula Zn4Si2O7(OH)2•H2O 
Core Elements Zn 
Thermal Decomposition
Zn4Si2O7(OH)2•H2O
°C
ZnO

Hemimorphite is a hydrated zinc silicate, and a primary source of zinc;