Rittmannite, a New Mineral Species of the Whiteite Group from the Mangualde Granitic Pegmatite, Portugal
Canadian Mineralogist Vol. 27, pp. 447-449 (1989) RITTMANNITE, A NEW MINERAL SPECIES OF THE WHITEITE GROUP FROM THE MANGUALDE GRANITIC PEGMATITE, PORTUGAL YVONNE MARZONI FECIA DI CaSSATa AND PAOLO ORLANDI Dipartimento di Scienze delta Terra, Universita di Pisa, Via S. Maria 53, 56126 Pisa, Italy mov ANNA VEZZALINI Istituto di Mineralogia Petrografia, Universita di Modena, Via S. Eufemia 19, 41100 Modena, Italy ABSTRACT la formule (Mno.S4Cao.47b.OlMn1.oo(FeI.~sMno.S6Mgo.29) r;2.oo(Al1.7sFeo.2s)r;2.oo(OHh.02(P04)4.8H20. Densite mesu- Rittmannite, a new mineral species, is the MnMnFe ree 2.81(1), et calculee pour Z = 2, 2.83. La rittmannite analog of whiteite. It was found in altered phosphatic "nod- est biaxe positive. CXmes1.622, (3eale 1.626, 'Yeale 1.654, 2 V roes wes" from the Mangualde granitic pegmatite, Portugal, 43(2)°; I'orientation de I'indicatrice optique est: Xllb, Z:e as very small (0.3 x 0.3 x 0.04 mm), pale yellow, tabu- + 7°. Aucun pleochroYsme n'a ete decele. Le nom honore lar, pseudohexagonal crystals forming aggregates of sub- M. Ie professeur Alfred Rittman (1893-1980), volcanolo- parallel individual crystals. It occurs on kryzhanovskite, gue de renommee mondiale qui a contribue au developpe- frondeIite, hureaulite and adularia. Rittmannite is ment de la mineralogie, la petrographie et la microscopie monoclixyc, space group P2la, a !5.01(4), b 6.89(3), e optique. 10.16(3) A, (3 112.82(25)°, V 968(4) A3. The strongest lines (Traduit par la Redaction) in the X-ray powder-diffraction pattern [d in A(Iob,)(hkl)] are: 9.38(8)(001), 4.69(m8)(002), 2.802(8)(222).
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