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mineralia:

Rhodochrosite (Pseudomorph after Calcite) from Greece

“This beautiful specimen is an extraordinary example of pseudomorphosis, wherein the original mineral (calcite) left its distinct crystal form and was replaced by a new mineral, the pink rhodochrosite. Thus, this specimen illustrates the typical characteristics of rhodochrosite—pink color, a greater hardness and weight than calcite, and a chemical composition primarily composed of manganese—but it will retain forever the original form of its calcite host. It was coated lightly at a later time in its history by a light crust of tiny colorless quartz crystals. There are a number of small pyrite crystals down one side of the matrix”.

by World’s Finest Minerals and Crystals

mineralia:

Smoky Quartz from Norway

by Exceptional Minerals

mineralia:

Calcite from Illinois

by Exceptional Minerals

mineralia:

Spessartine Garnets with Smoky Quartz on Albite from China

by Exceptional Minerals

mineralia:

Dioptase with Dolomite and Duftite from Namibia

by Dan Weinrich

mineralia:

Dioptase with Dolomite and Duftite from Namibia

by Dan Weinrich

mineralia:

Dioptase and Calcite from Namibia 

by The Akenstone

mineralia:

Chalcopyrite with Quartz from Colorado

by Dan Weinrich

mineralia:

Azurite with Duftite from Namibia

by Dan Weinrich

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mineralia:

Fluorite with Galena from England

by Dan Weinrich