Panguite
- IMA 2010-057
Panguit is a very rarely occurring mineral from the mineral class of " oxides and hydroxides ". It crystallizes in the orthorhombic crystal system with the chemical composition ( Ti 4 , Sc, Al, Mg, Zr, Ca) 1.8 O3 and shows up in the expression of only known as meteorites inclusion.
Chemistry
Panguit consists mainly of titanium dioxide (TiO2, 47.97 %) and proportions of oxides of zirconium oxide (ZrO2 14.61% ), scandium ( Sc2O3 10.67 % ), aluminum oxide (Al2O3 7.58% ), magnesium oxide (MgO 5, 54%), yttrium ( Y2O3 5.38% ), calcium ( 3.34% CaO ), silicon (SiO 2 1.89% ), iron ( FeO 1.81% ), vanadium ( 0.95% V2O3 ), chromium ( Cr2O3 0.54 %) and traces of hafnium ( HfO2 0.28 %). The empirically derived formula is then calculated as [( Ti0.79Zr0.16Si0.04 ) 4 Σ0.99 ( Sc0.20Al0.20Y0.06V0.02Cr0.01 ) 3 Σ0.49 ( Mg0.18Ca0.08Fe0.03 ) 2 Σ0.29 ] Σ1.77O3O3.
Etymology and history
Panguit 2010 by Chi Ma, Oliver Tschauner, John R. Beckett, George R. Rossman and Wenjun Liu was first discovered in electron microscopic studies of the Allende meteorite at the California Institute of Technology. According to its discoverer Panguit to be one of the first solid compounds which had formed in the formation of the solar system some 4.5 billion years ago. Therefore, in accordance with its early date they named the mineral after Pangu, the first according to the Chinese mythology creatures from his body after his death, the universe with the sun, moon and earth came into being.
The mineral and the selected Chi Ma and his colleagues name " Panguite " was recognized in December 2010 by the Commission on New Minerals Nomenclature and Classification of the International Mineralogical Association ( IMA / CNMNC ).
Holotypmaterial from the section MC2Q the meteorite sample " Caltech Allende12A " was at the National Museum of Natural History of the Smithsonian Institution in Washington DC deposited (Catalog: USNM 7602 ).
Classification
Since Panguit was only in 2011 recognized as a separate mineral, it is not listed in the outdated since 2001 classification of minerals according to Strunz ( 8th edition ). In the so -called " Lapis - system ", which still depends in deference to private collectors and institutional collections according to the classical scheme of Karl Hugo Strunz, the mineral within the class of " oxides and hydroxides " in the department of " oxides with molar ratio of metal: oxygen = 2:3 "and, where it forms together with maghemite the unnamed group IV/C.06.
The classification of Panguit after used by the IMA classification of minerals according to Strunz ( 9th edition ) is not yet known.
In the far less common Hoelzel systematics Panguit belongs to " Betafit group at the titanium on the structural position dominates B " with the system no. 4.CJ.1.
Education and Locations
The formation was extraterrestrial, it occurs in pockets of the so-called Allende meteorite, which in Mexico 1969 - came down Allende - Chihuahua. Panguit has so far (as of 2012) only be detected in this meteorite.
Crystal structure
Panguit crystallizes in the orthorhombic space group Pbca space group no. 61 with the lattice parameters a = 9.781 Å; b = 9.778 Å and c = 9.815 Å and 16 formula units per unit cell.