azurit z dolu Shilu,provincie Kuang-tung, Čína

Azurite, common in Europe and Asia, is produced by the weathering of copper ore deposits. It was crushed and powdered and used as a pigment from ancient times,

Dolomit Rumunia.jpg

Dolomit Rumunia.jpg

Kalcit ze sbírek Národního muzea v Praze, původem z Čech.

Kalcit ze sbírek Národního muzea v Praze, původem z Čech.

Vzorek magnetitu z italského regionu Trentino-Alto Adige.

Magnetite exposed on the ground. The mineral is black and irregularly smooth. Individual chunks jut at angles characteristic of the crystal habit.

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