Английская Википедия:Clarkeite
Шаблон:Short description Шаблон:Infobox mineral Clarkeite is a uranium oxide mineral with the chemical formulaШаблон:Chem or Шаблон:Chem.
Its color varies from dark brown to reddish orange. Clarkeite forms by oxidation and replacement of uraninite late during pegmatite crystallization. Although uraninite-bearing granite pegmatites are common, clarkeite is rare and occurs intimately intergrown with other uranium minerals.
It is known from only two localities; the Spruce Pine pegmatite district in western North Carolina, US, and Rajputana, in the Ajmer district, India. Clarkeite is the only known naturally occurring high-temperature uranate. The general formula for ideal clarkeite is Шаблон:Chem.
It was named for Frank Wigglesworth Clarke (1847–1931), American mineral chemist, and former chief chemist of the United States Geological Survey.
See also
References
- Clarkeite: New chemical and structural data
- Clarkeite: Clarkeite mineral information and data
- WebMineral
