Crystals? Stones? Gems ... used in architecture to smooth pebbles collected from riverbanks. Minerals, naturally occurring inorganic substances with a consistent structure and composition ...

Walk into any mineral shop and one of the first thing that sounds out is the precise, cubical shape of pyrite crystals. This ...

More than 4,000 naturally occurring minerals—inorganic solids that have a characteristic chemical composition and specific crystal structure—have been found on Earth. They are formed of simple ...

All rocks are made of one or more minerals. Minerals are solid, naturally occurring substances with well-defined crystal ...