Bakhchisaraitsevite
A valid IMA mineral species
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About Bakhchisaraitsevite
Alexander Y. Bakhchisaraitsev
Formula:
Na2Mg5(PO4)4 · 7H2O
Colour:
Light yellow, colourless or greenish
Lustre:
Vitreous
Hardness:
2 - 2½
Specific Gravity:
2.50
Crystal System:
Monoclinic
Name:
Named in honor of Alexander Yuryevich Bakhchisaraitsev (Александр Юрьевич Бахчисарайцев) (1947–1998), crystallographer from the Geological Institute of the Kola Scientific Center of the Russian Academy of Sciences, Apatity.
Unique Identifiers
Mindat ID:
7074
Long-form identifier:
mindat:1:1:7074:0
IMA Classification of Bakhchisaraitsevite
Approved
IMA Formula:
Na2Mg5(PO4)4·7H2O
Approval year:
1999
First published:
2000
Classification of Bakhchisaraitsevite
8.CH.50
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
H : With large and medium-sized cations, RO4:H2O < 1:1
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
H : With large and medium-sized cations, RO4:H2O < 1:1
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Bkc | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Bakhchisaraitsevite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Bakhchisaraitsevite
Vitreous
Transparency:
Transparent
Colour:
Light yellow, colourless or greenish
Streak:
White
Hardness:
2 - 2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001} perfect
{001} perfect
Density:
2.50(2) g/cm3 (Measured) 2.499 g/cm3 (Calculated)
Comment:
Calculated value from Yakubovich et al. (2000).
Optical Data of Bakhchisaraitsevite
Type:
Biaxial (+)
RI values:
nα = 1.538(1) nβ = 1.54(1) nγ = 1.543(1)
2V:
Calculated: 72.5°
Max. Birefringence:
δ = 0.005
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
None to Very Low
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
none
Chemistry of Bakhchisaraitsevite
Mindat Formula:
Na2Mg5(PO4)4 · 7H2O
Element Weights:
Crystallography of Bakhchisaraitsevite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 8.3086(8) Å, b = 12.906(1) Å, c = 17.486(2) Å
β = 102.01(1)°
β = 102.01(1)°
Ratio:
a:b:c = 0.644 : 1 : 1.355
Unit Cell V:
1834 ų
Z:
4
Twinning:
None observed
Comment:
From Yakubovich et al. (2000).
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Show
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Big Balls | Small Balls | Just Balls | Spacefill
Polyhedra Off | Si Polyhedra | All Polyhedra
Remove metal-metal sticks
Display Options
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
Black Background | White Background
Perspective On | Perspective Off
2D | Stereo | Red-Blue | Red-Cyan
View
CIF File Best | x | y | z | a | b | c
CIF File Best | x | y | z | a | b | c
Rotation
Stop | Start
Stop | Start
Labels
Console Off | On | Grey | Yellow
Console Off | On | Grey | Yellow
Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005687 | Bakhchisaraitsevite | Yakubovich O V, Massa W, Liferovich R P, Pakhomovsky Y A (2000) 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 The Canadian Mineralogist 38 831-838 |  | 2000 | Kovdor phoscorite - carbonatite complex, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.31 Å | (33) |
| 8.56 Å | (100) |
| 3.496 Å | (23) |
| 3.314 Å | (23) |
| 2.849 Å | (33) |
| 2.675 Å | (25) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 36 : Carbonatites, kimberlites, and related igneous rocks | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 49 : Oxic cellular biomineralization (see also #44) | <0.54 |
| 50 : Coal and/or oil shale minerals | <0.36 |
| Stage 10b: Anthropogenic minerals | <10 Ka |
| 54 : Coal and other mine fire minerals (see also #51 and #56) |
Type Occurrence of Bakhchisaraitsevite
General Appearance of Type Material:
Fan-shaped aggregates or as single bladed tabular crystals up to 0.5 × 1.5 × 2 mm.
Place of Conservation of Type Material:
Mining Museum of the Saint Petersburg Mining Institute, Russia, and at the Geological Museum of the University of Oulu, Finland.
Geological Setting of Type Material:
In voids within veins of vuggy dolomite carbonatite
Associated Minerals at Type Locality:
Synonyms of Bakhchisaraitsevite
Other Language Names for Bakhchisaraitsevite
Dutch:Bakhchisaraitseviet
German:Bakhchisaraitsevit
Russian:Бахчисарайцевит
Simplified Chinese:水磷钠镁石
Spanish:Bakhchisaraitsevita
Traditional Chinese:水磷鈉鎂石
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.CH. | Georgeliuite | Ca2Mn3+3O2(AsO4)3(H2O)2 · H2O |
| 8.CH.05 | Natrowalentaite | [Fe3+0.5Na0.5(H2O)6][NaAs3+2(Fe3+2.33W6+0.67)(PO4)2O7] |
| 8.CH.05 | Walentaite | [Mn2+(H2O)6][◻As3+3Fe3+3(PO4)2O7] |
| 8.CH.05 | Halilsarpite | [Mg(H2O)6][CaAs3+2(Fe3+2.67Mo6+0.33)(AsO4)2O7] |
| 8.CH.10 | Anapaite | Ca2Fe2+(PO4)2 · 4H2O |
| 8.CH.15 | Picropharmacolite | Ca4Mg(AsO4)2(HAsO4)2 · 11H2O |
| 8.CH.20 | Dittmarite | (NH4)Mg(PO4) · H2O |
| 8.CH.20 | Niahite | (NH4)Mn2+(PO4) · H2O |
| 8.CH.25 | Taranakite | K3Al5(PO3OH)6(PO4)2 · 18H2O |
| 8.CH.25 | Francoanellite | K3Al5(PO3OH)6(PO4)2 · 12H2O |
| 8.CH.25 | Macivorite | (NH4)3Al5(PO3OH)6(PO4)2 · 18H2O |
| 8.CH.30 | Schertelite | (NH4)2MgH2(PO4)2 · 4H2O |
| 8.CH.35 | Hannayite | (NH4)2Mg3H4(PO4)4 · 8H2O |
| 8.CH.40 | Hazenite | KNaMg2(PO4)2 · 14H2O |
| 8.CH.40 | Struvite-(K) | KMg(PO4) · 6H2O |
| 8.CH.40 | Struvite | (NH4)Mg(PO4) · 6H2O |
| 8.CH.45 | Rimkorolgite | (Mg,Mn)5(Ba,Sr,Ca)(PO4)4 · 8H2O |
| 8.CH.55 | Smolyaninovite | Co3Fe3+2(AsO4)4 · 11H2O |
| 8.CH.55 | Fahleite | CaZn5Fe3+2(AsO4)6 · 14H2O |
| 8.CH.60 | Barahonaite-(Fe) | (Ca,Cu,Na,Fe3+,Al)12Fe3+2(AsO4)8(OH,Cl)x · nH2O |
| 8.CH.60 | Barahonaite-(Al) | (Ca,Cu,Na,Fe3+,Al)12Al2(AsO4)8(OH,Cl)x · nH2O |
| 8.CH.70 | Epifanovite | NaCaCu5(PO4)4[AsO2(OH)2] · 7H2O |
| 8.CH.75 | Esdanaite-(Ce) | NaMnCe(PO4)2 · 4H2O |
Fluorescence of Bakhchisaraitsevite
Not fluorescent
Other Information
Notes:
Soluble in 10% HCl
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Bakhchisaraitsevite
mindat.org URL:
https://www.mindat.org/min-7074.html
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Please feel free to link to this page.
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References for Bakhchisaraitsevite
Reference List:
Yakubovich, O. V., Massa, W., Liferovich, R. P., Pakhomovsky, Y. A. (2000) 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. The Canadian Mineralogist, 38 (4) 831-838 doi:10.2113/gscanmin.38.4.831
Mandarino, Joseph A. (2001) New minerals. The Canadian Mineralogist, 39 (5) 1473-1502 doi:10.2113/gscanmin.39.5.1473
Localities for Bakhchisaraitsevite
Showing 5 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Chile | |
| Joy Desor material. EDS verified. Jason ... |
| XRD by Joachim Lorenz +1 other reference | |
Russia | |
| |
| Belovitskaya et al. (2004) +1 other reference |
| Liferovich et al. (2000) +4 other references |
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Kovdor Zheleznyi Mine, Kovdor Massif, Kovdorsky District, Murmansk Oblast, Russia