Pinterest • O catálogo mundial de ideias

Aquamarine. Bruce CAIRNCROSS / Mineral Friends <3

Marcasite (a sulfide mineral sometimes called white iron pyrite) with Pyrite, Arsenopyrite, Calcite and Dolomite. Marcasite and Pyrite are polymorphs. They have the same mineral composition but different crystal structures. Pyrite has a cubic structure and is hard enough to be used in jewelry, while Marcasite has an unstable orthorhombic crystal structure and is liable to break apart.

dogtooth calcite crystals atop the amethystine substrate Hubei province of China

Watermelon Tourmaline cluster. W O W ! ! ! From Sapo Mine, Golabeira, Doce Valley, Minas Gerais, Brazil

Phantomed amethyst clusters with accents of green Celadonite, Brazil.