• Clarkeite - Wikipedia

    en.wikipedia.org/wiki/Clarkeite Clarkeite is a uranium oxide mineral of composition (Na,Ca,Pb) 2 (UO 2) 2 (O,OH) 3 or (Na,Ca,Pb)(UO 2)O(OH)·0-1H 2 O. The color of samples varies from dark brown to reddish orange. Clarkeite forms by oxidation and replacement of uraninite late during pegmatite crystallization.
  • Clarkeite: Mineral information, data and localities.

    www.mindat.org/min-1059.html Clarkeite is a waxy to resinous dark brown replacement of uraninite. It is very uncommon, but is frequently misidentified with brown gummite that is dominated by schoepite-group minerals.Frondel (1956) warned: "Clarkeite is best identified by its X-ray powder pattern.
  • Clarkeite | Definition of Clarkeite by Merriam-Webster

    www.merriam-webster.com/dictionary/clarkeite Clarkeite definition is - a rare dark brown radioactive mineral whose chief constituent is uranium oxide (specific gravity 6.39).
  • What does clarkeite mean?

    www.definitions.net/definition/clarkeite Definition of clarkeite in the Definitions.net dictionary. Meaning of clarkeite. What does clarkeite mean? Information and translations of clarkeite in the most comprehensive dictionary definitions resource on the web.
  • clarkeite - The Mineral and Gemstone Kingdom

    www.minerals.net/mineral-variety/mineral/clarkeite.aspx clarkeite. Brown formation of Gummite from Spruce Pine, North Carolina, that forms between yellow Gummite and black Uraninite. Back ...
  • Clarkeite | Article about clarkeite by The Free Dictionary

    encyclopedia2.thefreedictionary.com/clarkeite Howard already has more than half the 165 MPs on his side, including Portillistas and Clarkeites, and preaches peace and reconciliation for the party and the nation.
  • Clarkeite Mineral Data

    webmineral.com/data/Clarkeite.shtml Clarkeite is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram. Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 6.35 ± 1.59 grams of pure Clarkeite .

    www.minsocam.org/ammin/AM16/AM16_213.pdf clarkeite are uraninite for dilute mineral acids dissolve the clarkeite rather readily leaving behind minute dark specks which are decom-posed on continued boiling. A visual estimation of the percentage quantity of the uraninite in the analyzed specimen of clarkeite would be somewhere in the neighborhood of 1 or 2 per cent. ANer,yrrc.q,r ...
  • (PDF) Clarkeite: New chemical and structural data

    www.researchgate.net/.../220039746_Clarkeite_New_chemical_and_structural_data Clarkeite crystallizes during metasomatic replacement of pegmatitic uraninite by late stage,oxidizing hydrothermal fluids. Samples are zoned compositionally: Clarkeite, which is Na rich, surrounds ...
  • Solubility measurements of the uranyl oxide hydrate phases ...

    www3.nd.edu/~fein/Publications/Gorman-Lewis%20JThermo%20(40)980.pdf 7), and clarkeite (Na(UO 2)O(OH)) and performed solubility measurements from both undersaturation and supersaturation under controlled-pH conditions. The solubility measurements rigorously constrain the values of the solubility products for these synthetic phases, and consequently the standard-state Gibbs free ener-gies of formation of the phases.