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Hardness

Gypsum Gypsum

Hardness: 2
Colour: Usually white, colourless or grey
Streak: White
Lustre: Vitreous to pearly
Other characteristics: Some samples are fluorescent

Gemstone quality: No - gypsum can crack quite easily and is too soft to be a gemstone.
Industrial uses: Is used in making cement, plaster board and plaster casts.

Cement Plasterboard Plaster cast

Gypsum is used in making cement, plaster board and plaster casts.

Return to Mohs scale to learn more about hardness.