Now, for the first time, examples of the mineral and rock specimens are being made available as digital images on the World-Wide Web. Biotite is a type of mica, a family of sheet silicates. Muscovite is a type of mica, a family of sheet silicates. Halite is the only mineral eaten by humans. Gypsum is the main component in plaster and wall board.
Calcite is a very common mineral and the main mineral in limestone.
It really is magnetic. Sphalerite is a common ore mineral of zinc. Talc is the main ingedient in talcum powder. A similar mineral called Troilite is common in meteorites. Augite is the most common member of the pyroxenes.