Preobrazhenskite
A valid IMA mineral species - grandfathered
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About Preobrazhenskite
Pavel I. Preobrazhenskii
Formula:
Mg3B11O15(OH)9
Colour:
Colourless, lemon-yellow, dark gray
Lustre:
Vitreous
Hardness:
4½ - 5
Specific Gravity:
2.45 (Calculated)
Crystal System:
Orthorhombic
Name:
Named in honor of Pavel Ivanovich Preobrazhenskii (Павел Иванович Преображенский) (13 January 1874, Demyansk, Novgorod Province, Russian Empire - 10 September 1944, Moscow, USSR), geologist with the Institute of Halurgy, St. Petersburg, and the Institute of Mining and Chemical Stock, Moscow, Russia and professor in the Department of Geology and Mineralogy, Perm University. He was an expert in Russian salt deposits and was a discoverer of the Inder deposit, Kazakhstan.
This page provides mineralogical data about Preobrazhenskite.
Unique Identifiers
Mindat ID:
3280
Long-form identifier:
mindat:1:1:3280:9
IMA Classification of Preobrazhenskite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1956
Classification of Preobrazhenskite
6.GB.15
6 : BORATES
G : Heptaborates and other megaborates
B : Phyllo-nonborates, etc.
6 : BORATES
G : Heptaborates and other megaborates
B : Phyllo-nonborates, etc.
25.7.1.1
25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
7 : Nonaborates
25 : ANHYDROUS BORATES CONTAINING HYDROXYL OR HALOGEN
7 : Nonaborates
9.2.5
9 : Borates
2 : Borates of Be and Mg
9 : Borates
2 : Borates of Be and Mg
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 |
|---|---|---|
| Pbz | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Preobrazhenskite
Vitreous
Transparency:
Translucent
Colour:
Colourless, lemon-yellow, dark gray
Streak:
White
Hardness:
4½ - 5 on Mohs scale
Density:
2.45 g/cm3 (Calculated)
Optical Data of Preobrazhenskite
Type:
Biaxial (+)
RI values:
nα = 1.573 - 1.576 nβ = 1.573 - 1.576 nγ = 1.594 - 1.596
Max. Birefringence:
δ = 0.020 - 0.021
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:
Moderate
Dispersion:
relatively strong
Chemistry of Preobrazhenskite
Mindat Formula:
Mg3B11O15(OH)9
Element Weights:
Elements listed:
Crystallography of Preobrazhenskite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/m) - Dipyramidal
Space Group:
Pbcm
Setting:
Pbcm
Cell Parameters:
a = 16.291(4) Å, b = 9.181(2) Å, c = 10.571(2) Å
Ratio:
a:b:c = 1.774 : 1 : 1.151
Unit Cell V:
1,581.08 ų (Calculated from Unit Cell)
Z:
4
Morphology:
crystals to 4 cm, in nodules and granular massive.
Crystal Structure
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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) |
|---|---|---|---|---|---|---|---|
| 0005367 | Preobrazhenskite | Burns P C, Hawthorne F C (1994) Structure and hydrogen bonding in preobrazhenskite, a complex heteropolyhedral borate The Canadian Mineralogist 32 387-396 |  | 1994 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.28 Å | (100) |
| 3.79 Å | (100) |
| 3.230 Å | (90) |
| 3.187 Å | (90) |
| 2.821 Å | (90) |
| 2.769 Å | (90) |
| 2.641 Å | (90) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 25 : Evaporites (prebiotic) |
Type Occurrence of Preobrazhenskite
General Appearance of Type Material:
Nodules in fine-grained halite-polyhalite rock and encloses kaliborite and boracite. In places it has been partially replaced by inyoite.
Place of Conservation of Type Material:
1) Mining Institute, St. Petersburg, Russia, 1497/1–2,5.
2) A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 57015.
2) A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 57015.
Associated Minerals at Type Locality:
Other Language Names for Preobrazhenskite
Common Associates
Related Minerals - Strunz-mindat Grouping
| 6.GB.05 | Studenitsite | NaCa2[B9O14(OH)4] · 2H2O |
| 6.GB.10 | Penobsquisite | Ca2Fe2+[B9O13(OH)6]Cl · 4H2O |
| 6.GB.20 | Walkerite | Ca16(Mg,Li,◻)2[B13O17(OH)12]4Cl6 · 28H2O |
Other Information
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 Preobrazhenskite
mindat.org URL:
https://www.mindat.org/min-3280.html
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References for Preobrazhenskite
Localities for Preobrazhenskite
Showing 2 localities.
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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.
Kazakhstan (TL) | |
| Yarzhemskii (1956) +3 other references |
| Handbook of Mineralogy Vol V p 6 |
Quick NavTopAbout PreobrazhenskiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionGeological EnvironmentType Occurrence Other LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
Inder B deposit and salt dome, Inder District, Atyrau Region, Kazakhstan