Sphalerite

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Sphalerite 
Frequency uncommon 
Hardness 3.5-4 
Density 4
Chemical Formula {{#Chem:ZnS}} 
Core Elements Zn 
Thermal Decomposition
{{#Chem:ZnS}}
°C
{{#Chem:ZnO}}

Sphalerite is a primary ore of zinc