Malachite

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Malachite 
Frequency common 
Hardness 3.5-4 
Density 3.6-4
Chemical Formula {{#Chem:Cu2CO3*Cu(OH)2}} 
Core Elements Cu 
Thermal Decomposition
{{#Chem:Cu2CO3*Cu(OH)2}}
290°C
{{#Chem:CuO}}

Malachite, along with Azurite, is a primary ore of copper.