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Hardness

Calcite Calcite

Hardness: 3
Colour: Usually white, colourless or light yellow
Streak: White
Lustre: Vitreous
Other characteristics: Fizzes in dilute acids, some samples are fluorescent

Gemstone quality: No - calcite can crack quite easily and is too soft to be used in jewellery.
Industrial uses: Calcite makes up rocks like limestone and marble - important building stones. It is also used in making cement.

The Museum Cement

The Museum is built of calcite in the form of limestone. Calcite is also used in cement.

Return to Mohs scale to learn more about hardness.