Haiweeite is a mineral of

uranium Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium is weak ...

and has the chemical formula: Ca UO₂)₂Si₅O₁₂(OH)₂�3(H₂O). It is a secondary mineral of uranium, a product of

oxidation Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a ...

. It has a greenish yellow color. It has a

Mohs hardness The Mohs scale of mineral hardness () is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of various minerals through the ability of harder material to scratch softer material. The scale was introduced in 1812 by t ...

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.

References

Mindat.orgHandbook of MineralogyWebmineral data
Uranium(VI) minerals Nesosilicates {{silicate-mineral-stub