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Bakhchisaraitsevite.

Monoclinic

Chairman Emeritus of the Commission on New Minerals and Mineral Names of the International Mineralogical Association and Curator Emeritus

Department of Mineralogy

Royal Ontario Museum

100 Queen's Park

Toronto, Ontario, Canada M5S 2C6

[Na.sub.2][Mg.sub.5][[[PO.sub.4]].sub.4]*7[H.sub.2]O

Locality: Kovdor massif, southwest Kola Peninsula, Russia (Lat. 67[degrees]35' N, Long. 30[degrees]20' E).

Occurrence: In a mineralized vuggy dolomite carbonatite. Associated minerals are: bobierrite, pyrite, collinsite, "chlorite," nastrophite and juonniite.

General appearance: Fan-shaped aggregates or single bladed tabular crystals (up to 0.5 x 1.5 x 2 mm).

Physical, chemical and crystallographic properties: Luster: vitreous. Diaphaneity: transparent. Color: light yellow, colorless or greenish. Streak: white. Luminescence: nonfluorescent. Hardness: 2 to 21/2 Tenacity: brittle.

Cleavage: {001} perfect. Fracture: not mentioned. Density: 2.50 g/[cm.sup.3] (meas.), 2.44 g/[cm.sup.3] (calc.) (given as 2.47 g/[cm.sup.3]). Crystallography: Monoclinic, [P2.sub.1]/c, a 8.324, b 12.926, c 17.519 A, [beta] 102.03[degrees], V 1844 [A.sup.3], Z 4, a:b:c = 0.6440:1:1.3553. Morphology: no forms were mentioned. Twinning: none mentioned. X-ray powder diffraction data: 10.31 (33) (011), 8.56 (100) (002), 3.562 (22) (123), 3.496 (23) (T24), 3.314 (23) (204), 3.020 (28) (125), 2.849 (33) (231), 2.675 (25) (125, 232). Optical data: Biaxial (+), [alpha] 1.538, [beta] 1.540, [gamma] 1.543, 2V(meas.) not given, 2V(calc.) 79[degrees] (given as 72.5[degrees]). X ^ c = 45[degrees], Z = b. Chemical analytical data: Ten sets of electron microprobe data are give. One of these is: [Na.sub.2]O 9.17, MgO 29.40, CaO 0.07, MnO 0.33, FeO 0.84, [P.sub.2][O.sub.5] 41.57, [H.sub.2]O (18.62), Total (100.00) wt.%. [H.sub.2]O was calculated by difference. Empirical formula: [([Na.sub.2.01][Ca.sub.0.01]).sub.[sigma]2.02][(Mg.sub.4.95][Fe.sub.0 .08]-[Mn.sub.0.03]).sub.[sigma]5.06][([PO.sub.4]).sub.3.97][O.sub.012 ]*7.00[H.sub.2]O. Relationship to other species: It is somewhat similar to rimkorolgite, [Mg.sub.5]Ba[([PO.sub.4]).sub.4]*8[H.sub.2]O.

Name: For Alexander Yu. Bakhchisaraitsev (1947-1998) who studied minerals of the Kola Peninsula for 30 years and discovered eight new mineral species. Comments: IMA No. 1999-005.

LIFEROVICH. R. P., PAKHOMOVSKY, Ya. A., YAKUBOVICH, O. V., MASSA, W., LAAJOKI, K., GEHOR, S., BOGDANOVA, A. N., and SOROKHTINA, N. V. (2000) Bakhchisaraitsevite, [Na.sub.2][Mg.sub.5][[[PO.sub.4]].sub.4]*7[H.sub.2]O, a new mineral from hydrothermal assemblages related to phoscorite-carbonatite complex of the Kovdor massif, Russia. Neues Jahrbuch fur Mineralagie, Monatshefte 2000, 402-418.

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Author:Mandarino, J.A.
Publication:The Mineralogical Record
Geographic Code:1CANA
Date:Sep 1, 2001
Words:485
Previous Article:Arakiite.
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