Boracite

Mg3B7O13Cl

This sample of boracite is displayed in the Smithsonian Museum of Natural History. Boracite is a mineral which contains magnesium and boron with the composition Mg3B7O13Cl. This sample is about 6x5 cm with the cubic crystal being on the order of a centimeter. It is from Wathlingen, Niedersachsen, Germany.

Mindat: Boracite

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