Cerussite

The "Light of The Desert" is the world's largest faceted cerussite, a very soft gem notoriously difficult to facet. Jewelry aficionados can't wear this gem species easily. The "Light" is no lightweight. It weighs 898 carats, around 6.33 oz, and measures about as large as a human palm. It resides in the Royal Ontario Museum in Toronto, Canada. Photo by Miranda1989. Public domain.

Article: What is Gemstone Dispersion?

Credit: Miranda1989