• Polycrase-(Y): Mineral information, data and localities.

    www.mindat.org/min-3257.html 3 photos of Polycrase-(Y) associated with Spessartine: Mn 2+ 3 Al 2 (SiO 4) 3: 2 photos of Polycrase-(Y) associated with Thortveitite: Sc 2 Si 2 O 7: 2 photos of Polycrase-(Y) associated with Quartz: SiO 2: 1 photo of Polycrase-(Y) associated with Allanite-(Ce) {CaCe}{Al 2 Fe 2+}(Si 2 O 7)(SiO 4)O(OH) 1 photo of Polycrase-(Y) associated with ...
  • Polycrase-(Y) Mineral Data

    www.webmineral.com/data/Polycrase-(Y).shtml Polycrase-(Y) 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) 50.37 ± 12.59 grams of pure Polycrase-(Y) . Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 100 cm box) 5037.0 ±1259.3 grams of pure Polycrase-(Y) .
  • Polycrase - Wikipedia

    en.wikipedia.org/wiki/Polycrase 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) 2 O 6.It is amorphous. It has a Mohs hardness of 5 to 6 and a specific gravity of 5. It is radioactive due to its uranium content (around 6%). It occurs in granitic pegmatites.. Polycrase forms a continuous series with the niobium rich rare earth oxide euxenite.
  • Wisconsin Geological & Natural History Survey » Polycrase-(Y)

    wgnhs.wisc.edu/minerals/polycrasey Formula: (Y,U)(Ti,Nb) 2 O 6 Orthorhombic Description: Polycrase-(Y) is a rare black metallic mineral found as flattened prismatic crystals or masses in chemically complex pegmatites. MARATHON COUNTY: Small grains of polycrase (Y) occur in pegmatite at the Koss Pit several miles east of Wausau, Wisconsin (Tom Buchholz, 2002, personal communication).
  • Polycrase-(Y) - National Gem Lab

    nationalgemlab.in/polycrase-y Polycrase-(Y) is a very rare radioactive mineral that belongs to the Polycrase Group of minerals that includes Euxenite-(Y), Polycrase-(Y) and Yttrocrasite-(Y). Because of the rare earth metals in its structure, Polycrase-(Y) is one of several minerals called “Rare Earth Oxides”. Other rare earth oxides such as Aeschynite, Fergusonite and Samarskite have very similar properties to ...
  • Polycrase-(Y) - Mindat.org

    www.mindat.org/gm/3257 5.2 x 2.7 x 2.0 cm. Polycrase-(Y) is a rare multiple-oxide containing Y, U, Ti or Nb and is mainly found in pegmatites. Specimens labeled as being from this obscure locality may be from a pegmatite district around the cities of Rio Pomba and Uba (MINDAT). Specimens of any species are rare from this district.
  • Polycrase-(Y) - ClassicGems.net

    www.classicgems.net/gem_polycrase-Y.htm Polycrase-(Y) is a very rare radioactive mineral that belongs to the Polycrase Group of minerals that includes Euxenite-(Y), Polycrase-(Y) and Yttrocrasite-(Y). Because of the rare earth metals in its structure, Polycrase-(Y) is one of several minerals called "Rare Earth Oxides".
  • Polycrase-(Y) Mineral Data - Mineralogy Database

    webmin.mindat.org/data/Polycrase-(Y).shtml Polycrase-(Y) is Radioactive as defined in 49 CFR 173.403. Greater than 70 Bq / gram. Greater than 70 Bq / gram. Estimated Maximum U.S. Postal Shipping Size (10 mRem/hr limit, Unshielded 10 cm box) 50.37 ± 12.59 grams of pure Polycrase-(Y) .
  • Polycrase | Definition of Polycrase by Merriam-Webster

    www.merriam-webster.com/dictionary/polycrase Polycrase definition is - a mineral (Y,Ca,Ce,U,Th)(Ti,Cb,Ta)2O6 consisting of a columbate and titanate of the metals of the yttrium group that is isomorphous with euxenite (hardness 5—6, specific gravity 5).
  • Category:Polycrase-(Y) - Wikimedia Commons

    commons.wikimedia.org/wiki/Category:Polycrase-(Y) Media in category "Polycrase-(Y)" This category contains only the following file.