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Hardness

Apatite Apatite

Hardness: 5
Colour: Usually green but also yellow, blue, reddish-brown or purple
Streak: White
Lustre: Vitreous to greasy, sometimes waxy
Other characteristics: A 'partially dissolved' look, like boiled sweets that have been in your mouth for a while

Gemstone quality: Attractive crystals can be cut as gemstones, but apatite is still too soft to be used much in jewellery.
Industrial uses: Important source of phosphate in fertilisers.

Return to Mohs scale to learn more about hardness.