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Ametista - México

Ametista - México

Eu quero !

Eu quero !

Amethyst, Rio Grande do Sul State, Brazil

Amethyst, Rio Grande do Sul State, Brazil

O maior geodo de ametista do mundo ( ‘Empress of Uruguay’)

O maior geodo de ametista do mundo ( ‘Empress of Uruguay’)

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

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

Amethyst Quartz and Chalcopyrite - Cavnic, Maramures County, Romania / Mineral Friends <3

Amethyst Quartz and Chalcopyrite - Cavnic, Maramures County, Romania / 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.

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.

Crystal Quartz

Crystal Quartz

Béryl var. Emeraude sur Pyrite. Taille=1.2 cm

Béryl var. Emeraude sur Pyrite. Taille=1.2 cm

Ponta de Ametista

Ponta de Ametista

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