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    Kya Nite

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    ramzchile
    kyanite

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    Kya Nite

    Uploaded by

    ramzchile
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    kyanite

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    kyanite

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    28 views1 page

    Kya Nite

    Uploaded by

    ramzchile
    kyanite

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
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    of 1

    Kyanite Al2 SiO5

    °
    c 2001 Mineral Data Publishing, ver sion 1.2

    Crystal Data: Triclinic. Point Group: 1: Crystals bladed and tabular on f100g, elongated
    k to [001], to 0.5 m; typically bent or twisted. Twinning: Lamellar on f100g, twin axis ? f100g
    or k [010] or [001], common.

    Physical Properties: Cleavage: Perfect on f100g, good on f010g, (100) ^ (010) = 79± ;
    parting on f001g. Fracture: Splintery. Hardness = 5.5 k [001], 7 k [100]. D(meas.) = 3.53{3.65
    D(calc.) = [3.67]

    Optical Properties: Transparent to translucent. Color: Blue, white, rarely green, gray, yellow,
    pink, black, can be zoned; colorless to pale blue in thin section. Luster: Vitreous to pearly.
    Optical Class: Biaxial ({). Pleochroism: Weak; in thick sections, X = colorless; Y = violet-blue;
    Z = cobalt blue. Orientation: X ' ? f100g on f100g; X 0 ^ a = 0± {25± on f001g; Z 0 ^ c =
    27 ± {32 ± on f100g; Z 0 ^ c = 5 ± {8 ± on f010g. Dispersion: r > v; weak. ® = 1.710{1.718
    ¯ = 1.719{1.724 ° = 1.724{1.734 2V(meas.) = 78 ± {83 ±

    Cell Data: Space Group: P 1: a = 7.1262(12) b = 7.8520(10) c = 5.5724(10)


    ® = 89:99(2)± ¯ = 101:11(2)± ° = 106:03(1)± Z = 4

    X-ray Powder Pattern: Zillertal, Austria. (ICDD 11-46).


    3.18 (100), 1.377 (75), 3.35 (65), 1.962 (55), 1.935 (50), 1.930 (50), 2.520 (30)

    Chemistry: (1) (2) (1) (2)


    SiO2 36.68 37.08 MnO 0.00
    TiO2 0.00 MgO 0.02
    Al 2 O3 63.28 62.92 CaO 0.01
    Cr2 O 3 0.06 Na 2 O 0.00
    FeO 0.37 K2 O 0.01
    Total 100.43 100.00

    (1) Elovyi, Karelia; by electron microprobe. (2) Al2 SiO 5 :

    Polymorphism & Series: Trimorphous with andalusite and sillimanite.

    Occurrence: In gneisses, schists, included pegmatites, and quartz veins, from moderately
    high-pressure regional metamorphism of principally pelitic rocks; detrital in sedimentary rocks.

    Association: Staurolite, andalusite, sillimanite, talc, \hornblende," gedrite, mullite, corundum.

    Distribution: Widely distributed, even in good crystals. From Mt. Greiner, Zillertal, Tirol,
    Austria. At Alpe Sponda, Pizzo Forno, and at Alpe Campolungo, Tessin, Switzerland. In the
    P¯tschtal, Trentino-Alto Adige, Italy. From RÄoros, Norway. Around Yekaterinburg (Sverdlovsk),
    Ural Mountains, Russia. At Elovyi, Klavoloke, Karelia. From Sultan Hamud, Machakos district,
    Kenya. Large crystals from a number of localities in Minas Gerais, Brazil, as at Barro Pr^eto, S~a o
    Jos¶e do Jacuri. In the USA, at Lyme, Grafton Co., New Hampshire; at Judd's Bridge, Litch¯eld
    Co., Connecticut; at Darby, Delaware Co., Pennsylvania; from near Bakersville, Mitchell Co., and
    near Burnsville, Yancy Co., North Carolina; on Willis Mountain, Buckingham Co., Virginia.

    Name: From the Greek for blue, in allusion to its common dark blue color.

    Type Material: Mining Academy, Freiberg, Germany, 22491.

    References: (1) Dana, E.S. (1892) Dana's system of mineralogy, (6th edition), 500{501
    [cyanite]. (2) Deer, W.A., R.A. Howie, and J. Zussman (1982) Rock-forming minerals, (2nd
    edition), v. 1A, orthosilicates, 780{800. (3) Parkin, K.M., B.M. Loe²er, and R.G. Burns (1977)
    MÄossbauer spectra of kyanite, aquamarine, and cordierite showing intervalence charge transfer.
    Phys. Chem. Minerals, 1, 301{311. (4) Winter, J.K. and S. Ghose (1979) Thermal expansion and
    high-temperature crystal chemistry of the Al2 SiO 5 polymorphs. Amer. Mineral., 64, 573{586.
    All rights reserved. No par t of t his publication may b e reproduced, stored in a retrieval system or trans mitt ed in
    any form or by any means, electronic, mechanical, photocopying, recor di ng, or ot herwise without the prior written
    permis sion of Mineral Data Publi shing.

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