.... Van Velthuizen J. Dunn P.J. (1987) : Poudretteite, KNa 2 B 3 Si 12 O 30 , a new member of the osumilite group from Mont Saint-Hilaire, Quebec, and its crystal structure . Can. Mineral . 25 , 763 – 766 . Hawthorne F.C. (2002) : The use of end-member charge-arrangements...

... Mineralogist , 51 , 949 – 955 . Grice J.D. Ercit T.S. Van Velthuizen J. Dunn P.J. ( 1987 ) Poudretteite KNa 2 B 3 Si 12 O 30 , a new member of the osumilite group from Mont Saint-Hilaire, Quebec, and its crystal structure . Canadian Mineralogist , 25 , 763 – 766 . Hawthorne...

.... Inspection of the (ideal) site-populations listed in Table 2 gives us an idea of what ranges of charges to consider. For the A site, the formal charge varies from 2+ ( e.g ., A = Na 2 in poudretteite) to 8+ ( e.g ., A = Ti 4+ 2 in berezanskite). For the B site, the formal charge varies from 0 ( e.g...

... minerals of the milarite group . Can. Mineral . 37 , 769 – 774 . Grice , J.D. , Ercit , T.S. , van Velthuizen , J. & Dunn , P.J. ( 1987 ): Poudretteite KNa 2 B 3 Si 12 O 30 , a new member of the osumilite group from Mont Saint-Hilaire, Quebec, and its crystal structure . Can...

... of the new mineral studied here was recovered as a single crystal, and there is little direct evidence of coexisting mineral assemblages. However, notable gem minerals also found in the Pein Pyit gem gravels include danburite, poudretteite, hackmanite, orthoclase, scapolite, apatite, and muscovite, which...

... modes. We recognize five species as separate root mineral kinds: yagiite is found only as a minor phase in silicate inclusions of iron meteorites ( Bunch and Fuchs 1969 ); agakhanovite -(Y) ( Hawthorne et al. 2014 ) and poudretteite (B-bearing; Grice et al. 1987 ) are compositionally distinct...

..., zircon, garnet (almandine, grossular, hessonite, spessartite), alexandrite, chrysoberyl, iolite, quartz (amethyst, citrine), lapis-lazuli (lazurite), danburite, scheelite, titanite, topaz, tourmaline (rubellite, elbaite, schorl), hackmanite, etc., as well as some rare sorts like painite, poudretteite...