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    Balliranoite (Na, K) Ca (Si Al O) CL (CO)

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    ramzchile
    Balliranoite is a new mineral species from the cancrinite group found at the Monte Somma–Vesuvio volcanic complex in Italy. It has a hexagonal crystal structure and is transparent with a colorless streak and vitreous luster. Its chemical composition is (Na,K)6Ca2(Si6Al6O24)Cl2(CO3). It forms as a product of metasomatic reaction between alkaline magma and limestone, and is associated with orthoclase, phlogopite, clinohumite, calcite, diopside, pargasite, haüyne, and apatite.

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    Balliranoite (Na, K) Ca (Si Al O) CL (CO)

    Uploaded by

    ramzchile
    18 views1 page
    Balliranoite is a new mineral species from the cancrinite group found at the Monte Somma–Vesuvio volcanic complex in Italy. It has a hexagonal crystal structure and is transparent with a colorless streak and vitreous luster. Its chemical composition is (Na,K)6Ca2(Si6Al6O24)Cl2(CO3). It forms as a product of metasomatic reaction between alkaline magma and limestone, and is associated with orthoclase, phlogopite, clinohumite, calcite, diopside, pargasite, haüyne, and apatite.

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    balliranoite

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    Balliranoite is a new mineral species from the cancrinite group found at the Monte Somma–Vesuvio volcanic complex in Italy. It has a hexagonal crystal structure and is transparent with a colorless streak and vitreous luster. Its chemical composition is (Na,K)6Ca2(Si6Al6O24)Cl2(CO3). It forms as a product of metasomatic reaction between alkaline magma and limestone, and is associated with orthoclase, phlogopite, clinohumite, calcite, diopside, pargasite, haüyne, and apatite.

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    18 views1 page

    Balliranoite (Na, K) Ca (Si Al O) CL (CO)

    Uploaded by

    ramzchile
    Balliranoite is a new mineral species from the cancrinite group found at the Monte Somma–Vesuvio volcanic complex in Italy. It has a hexagonal crystal structure and is transparent with a colorless streak and vitreous luster. Its chemical composition is (Na,K)6Ca2(Si6Al6O24)Cl2(CO3). It forms as a product of metasomatic reaction between alkaline magma and limestone, and is associated with orthoclase, phlogopite, clinohumite, calcite, diopside, pargasite, haüyne, and apatite.

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    © All Rights Reserved
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    Balliranoite (Na,K)6Ca2(Si6Al6O24)Cl2(CO3)

    -
    Crystal Data: Hexagonal. Point Group: 6. Crystals, prismatic on {101 0} and striated along
    [0001], to 2 mm; as grains to 1 cm.
    -
    Physical Properties: Cleavage: Perfect on {101 0}. Fracture: n.d.
    Tenacity: Brittle. Hardness = 5 D(meas.) = 2.48(1) D(calc.) = 2.486(12)

    Optical Properties: Transparent. Color: Colorless. Streak: n.d.


    Luster: Vitreous.
    Optical Class: Uniaxial (+). ω = 1.523(2) ε = 1.525(2)

    Cell Data: Space Group: P63. a = 12.695(2) c = 5.325(1) Z=1

    X-ray Powder Pattern: Monte Somma–Vesuvio volcanic complex, Campania, Italy.


    4.797 (100), 3.281 (73), 2.662 (58), 3.669 (57), 2.446 (31), 2.120 (18), 2.754 (16)

    Chemistry: (1)
    SiO2 32.38
    Al2O3 27.28
    CaO 12.70
    Na2O 13.05
    K2O 3.08
    Cl 7.43
    SO3 1.96
    CO2 3.24
    H2O 0.19
    -O=Cl2 1.68
    Total 99.63

    (1) Monte Somma–Vesuvio volcanic complex, Campania, Italy; average of 5 analyses, CO2 by
    selective sorption, H2O by Penfield method and confirmed by IR, corresponding to
    Na4.70Ca2.53K0.73(Si6.02Al 5.98O23.995)Cl2.34(CO3)0.82(SO4)0.27· 0.12 H2O.

    Mineral Group: Cancrinite group.

    Occurrence: A product of metasomatic reaction between alkaline magma and limestone.

    Association: Orthoclase, phlogopite, clinohumite, calcite, diopside, pargasite, haüyne, apatite.

    Distribution: Monte Somma–Vesuvio volcanic complex, Campania, Italy.

    Name: Honors the Italian crystallographer Paolo Ballirano (b. 1964), Department of Earth Sciences,
    University of Rome, for contributions to the crystal chemistry of cancrinite group minerals.

    Type Material: A.E. Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow,
    Russia (catalog no. 3756/1).

    References: (1) Chukanov, N.V., N.V. Zubkova, I.V. Pekov, L.V. Olysych, E. Bonaccorsi, and
    D.Y. Pushcharovski (2010) Balliranoite, (Na,K)6Ca2(Si6Al6O24)Cl2(CO3), a new cancrinite-group
    mineral from Monte Somma–Vesuvio volcanic complex, Italy. Eur. J. Mineral., 22, 113–119. (2)
    (2010) Amer. Mineral., 95, 1595-1596 (abs. ref. 1).

    Mineralogical Society of America Handbook of Mineralogy Revised 1/14/2011

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