One of the mineral forms of Copper is azurite. Its chemical composition is Cu3(CO3)2(OH)2. The sample shown is about 20 cm long. It has an azurite crystal and a base containing another mineral form of copper, malachite.

All of the samples pictured here are on display at the Smithsonian Museum of Natural History.

The azurite is characteristically blue. The green color is characteristic of malachite. This image is close to actual size.

This is another manifestation of azurite where the blue color is not so prominent. The image is close to actual size.

This is a significantly larger sample, with vertical dimension probably 35 cm. It has azurite crystals on a base of malachite.

Selection of common minerals
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