Quartz, Hematite and Pyrite, from Cavinic Mine, Maramures, Romania (No.112)

Quartz is the second most abundant mineral in the Earth’s continental crust, after feldspar.

The mineral Pyrite, or iron pyrite, also known as fool's gold, is an iron sulphide. This mineral's metallic luster and pale brass-yellow hue give it a superficial resemblance to gold, hence the well-known nickname of fool's gold.