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

  • LANTHANE ET LANTHANIDES — Le lanthane et les lanthanides forment une série de quinze éléments métalliques de propriétés chimiques très semblables, que l’on désigne aussi plus communément sous le nom, d’ailleurs impropre, de «terres rares» (parce qu’on les a d’abord… …   Encyclopédie Universelle

  • 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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