Pure graphite is a mineral form of the element carbon (atomic number 6) and its symbol is C.
Gypsum, one of the most widely used minerals in the world, literally surrounds us every day.
Limestone is composed of carbonate minerals, notably calcite.
Silicon is the most abundant element on the earth's surface and in the form of silica.
antalum is found mainly in the minerals tantalite [(Fe,Mn)Ta2O6] (easily confused with columbite.
Actually Pyrite comes from a Greek word, Pyrite meaning Fire. Pyrite is the classic Fool's Gold.
Iron is the most abundant rock forming element and composes about 5 % of the Earth's Crust.
Biotite is an iron – magnesium – bearing member of the mica group of minerals.