polycrase

polycrase
A black or brown amorphous metallic complex uranium yttrium oxide mineral, found in granitic pegmatites.

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  • Polycrase — or polycrase (Y) is a black or brown metallic complex uranium yttrium oxide mineral with formula: (Y,Ca,Ce,U,Th)(Ti,Nb,Ta)2O6. It crystallizes in the orthorhombic system with typically radial prismatic crystal form. It has a Mohs hardness of 5 to …   Wikipedia

  • polycrase — poly·crase …   English syllables

  • polycrase — ˈ ̷ ̷ ̷ ̷ˌkrās, āz noun ( s) Etymology: German polykras, from poly + kras (from Greek krasis mixing, combination) more at krasis : a mineral (Y,Ca,Ce,U,Th)(Ti,Cb,Ta)2O6 …   Useful english dictionary

  • List of minerals N-R (complete) — It is currently not possible to have a complete list of minerals . The International Mineralogical Association is the international group that recognises new minerals and new mineral names, however minerals discovered before 1959 did not go… …   Wikipedia

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  • Dysprosium — (pronEng|dɪsˈproʊziəm) is a chemical element with the symbol Dy and atomic number 66. Characteristics Dysprosium is a rare earth element that has a metallic, bright silver luster, relatively stable in air at room temperature, but dissolving… …   Wikipedia

  • Tantalum — (pronEng|ˈtæntələm) (formerly tantalium IPA|/tænˈtæliəm/) is a chemical element with the symbol Ta and atomic number 73. A rare, hard, blue grey, lustrous, transition metal, tantalum is highly corrosion resistant and occurs naturally in the… …   Wikipedia

  • Rutile — Wine red rutile crystals from Binn Valley, Switzerland (Size: 2.0 x 1.6 x 0.8 cm) General Category Oxide minerals …   Wikipedia

  • Ilmenite — from Miask, Ilmen Mts, Chelyabinsk Oblast , Southern Urals, Urals Region, Russia. 4.5 x 4.3 x 1.5 cm General Category Oxide mineral …   Wikipedia

  • List of minerals — This is a List of minerals for which there are Wikipedia articles. Mineral variety names and mineraloids are to be listed after the valid minerals for each letter.For a complete listing (about 4,000) of all mineral names: List of minerals… …   Wikipedia

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