It is usually white to gray, and colourless in transmitted light.

It can also take on a yellow colour from sulfur impurities, or brown from iron oxides.

[2] Its mineral form was first described in 1800, and was named after Sasso Pisano, Castelnuovo Val di Cecina, Pisa Province, Tuscany, Italy where it was found.

[2] Media related to Sassolite at Wikimedia Commons

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