Bakhchisaraitsevite Mineral Data

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General Bakhchisaraitsevite Information

Chemical Formula:

Na2Mg5(PO4)4•7(H2O)

Composition:

Molecular Weight = 673.50 gm

Sodium 6.83 % Na 9.20 % Na₂O

Magnesium 18.04 % Mg 29.92 % MgO

Phosphorus 18.40 % P 42.15 % P₂O₅

Hydrogen 2.10 % H 18.72 % H₂O

Oxygen 54.64 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Mg₅(PO₄)₄•7(H₂O)

Environment:

In voids found in veins of vuggy dolomite carbonatite.

IMA Status:

Approved IMA 1999 (Dana # Added)

Locality:

Carbonatite complex of the Kovdor massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.

Name Origin:

Named for crystallographer Alexander Yu. Bakhchisaraitsev (1947-1998).

Synonym:

ICSD 89895

IMA1999-005

Bakhchisaraitsevite Image

Images:

Bakhchisaraitsevite

Comments: Yellow-brown, platy or thin tabular crystals of bakhchisaraitsevite from an Iron mine. Red arrow indicates the mineral.
Location: Kovdor massif, Kola peninsula, Russia. Scale: 5mm.
© Tom Loomis / Dakota Matrix

Images:

Bakhchisaraitsevite

Comments: Crystals of beige-colored bakhchisaraitsevite crystals in hydrothermal assemblage with colorless bobierrite on dolomite from a cavity in a deformed vein of dolomite carbonatite (CanMin, v 38, p 832).
Location: Kovdor Phosphorite-Carbonatite complex, Russia. Scale: See Image.
© Nataly A. Pekova

Bakhchisaraitsevite Crystallography

Axial Ratios:

a:b:c =0.6449:1:1.3565

Cell Dimensions:

a = 8.32, b = 12.9, c = 17.5, Z = 4; beta = 102° V = 1,837.20 Den(Calc)= 2.43

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 8.56(1), 2.849(0.33), 10.31(0.33),3.02(0.28), 2.675(0.25), 3.314(0.23), 3.496(0.23),

Crystal Structure:

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Yakubovich O V , Massa W , Liferovich R P , Pakhomovsky Y A , The Canadian Mineralogist , 38 (2000) p.831-838, The crystal structure of bakhchisaraitsevite,, [Na2(H2O)2]{(Mg4.5Fe0.5)(PO4)4(H2O)5}, a new mineral species of, hydrothermal origin from the Kovdor phoscorite - carbonatite complex, Russia, Locality: Kovdor phoscorite - carbonatite complex, Russia

Physical Properties of Bakhchisaraitsevite

Cleavage:

{001} Perfect

Color:

Colorless, Yellowish white, Greenish white.

Density:

2.5

Diaphaneity:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Bladed - Aggregates of thin lath-like crystals (e.g. kyanite).

Habit:

Fan Shaped - Occurs as radiating crystals shaped like a fan.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Bakhchisaraitsevite

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.019 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2224,KPDmeas= 0.2161,KC= 0.2181
Ncalc = 1.53 - 1.55

Optical Data:

Biaxial (+), a=1.538, b=1.54, g=1.543, bire=0.0050

Calculated Properties of Bakhchisaraitsevite

Electron Density:

Bulk Density (Electron Density)=2.52 gm/cc
note: Specific Gravity of Bakhchisaraitsevite =2.50 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_{Bakhchisaraitsevite}= 1.43 barns/electron
U=PE_{Bakhchisaraitsevite} x rElectron Density= 3.60 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Bakhchisaraitsevite is Not Radioactive

Bakhchisaraitsevite Classification

Dana Class:

40.05.17.01 (40)Hydrated Phosphates, etc

(40.05)with miscellaneous formulae

(40.05.17)Dana Group

40.05.17.01 Bakhchisaraitsevite! Na2Mg5(PO4)4•7(H2O) P 2₁/c 2/m

Strunz Class:

08.CH.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.C - Phosphates without Additional Anions, with H2O

08.CH -With large and medium-sized cations, RO4:H2O < 1:1

08.CH.50 Bakhchisaraitsevite! Na2Mg5(PO4)4•7(H2O) P 2₁/c 2/m

Other Bakhchisaraitsevite Information

References:

NAME( AmMin, vol 86, p 767) PHYS. PROP.(AmMin, vol 86, p 767) OPTIC PROP.(AmMin, vol 86, p 767)

See Also:

Links to other databases for Bakhchisaraitsevite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Bakhchisaraitsevite

Na2Mg5(PO4)4•7(H2O)
Dana No: 40.05.17.01 Strunz No: 08.CH.50
Locality:

Notes: