What is "haiweeite"

n. (context mineral English) An orthorhombic-dipyramidal mineral containing calcium, hydrogen, oxygen, silicon, and uranium.

Haiweeite is a mineral of uranium and has the chemical formula: Ca[(UO)SiO(OH)]·3(HO). It is a secondary mineral of uranium, a product of oxidation. It has a greenish yellow color. It has a Mohs hardness of about 3.5 and is fluorescent under UV light.

It was named after the Haiwee Reservoir, Inyo County, California, US, where it was first found.