Bakhchisaraitsevite Mineral Data
General Bakhchisaraitsevite Information
Chemical Formula:
Na2Mg5(PO4)4•7(H2O)
Composition:
Molecular Weight = 673.50 gm
Sodium 6.83 % Na 9.20 % Na2 O
Magnesium 18.04 % Mg 29.92 % MgO
Phosphorus 18.40 % P 42.15 % P2 O5
Hydrogen 2.10 % H 18.72 % H2 O
Oxygen 54.64 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Na2 Mg5 (PO4 )4 •7(H2 O)
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 - Prismatic H-M Symbol (2/m) Space Group: P 21 /c
X Ray Diffraction:
By Intensity(I/Io ): 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),
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:
PEBakhchisaraitsevite = 1.43 barns/electronU=PEBakhchisaraitsevite x r Electron 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:
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