Pseudosinhalite
A valid IMA mineral species
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About Pseudosinhalite
Formula:
Mg2Al3(BO3)2(OH)O3
Colour:
Colourless
Lustre:
Vitreous
Specific Gravity:
3.508 (Calculated)
Crystal System:
Monoclinic
Name:
The name alludes to the optical, chemical, and structural similarity to sinhalite.
Type Locality:
This page provides mineralogical data about Pseudosinhalite.
Unique Identifiers
Mindat ID:
7257
Long-form identifier:
mindat:1:1:7257:7
GUID
(UUID V4):
(UUID V4):
b5f158ca-fea4-46a9-ab41-fde336023a3b
IMA Classification of Pseudosinhalite
Classification of Pseudosinhalite
6.AC.10
6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference |
|---|---|---|
| Pshl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Pss | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Pseudosinhalite
Vitreous
Transparency:
Transparent
Colour:
Colourless
Streak:
White
Cleavage:
None Observed
Parting:
None observed
Fracture:
Conchoidal
Density:
3.508 g/cm3 (Calculated)
Optical Data of Pseudosinhalite
Type:
Biaxial (-)
RI values:
nα = 1.691 nβ = 1.713 nγ = 1.730
Max Birefringence:
δ = 0.039
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v or r < v
Chemistry of Pseudosinhalite
Mindat Formula:
Mg2Al3(BO3)2(OH)O3
Crystallography of Pseudosinhalite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 7.49(1) Å, b = 4.33(1) Å, c = 9.85(1) Å
β = 110.7(1)°
β = 110.7(1)°
Ratio:
a:b:c = 1.73 : 1 : 2.275
Unit Cell V:
298.83 ų (Calculated from Unit Cell)
Z:
2
Twinning:
Polysynthetic.
Comment:
Space group by analogy to synthetic material.
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) |
|---|---|---|---|---|---|---|---|
| 0012323 | Pseudosinhalite | Daniels P, Krosse S, Werding G, Schreyer W (1997) "Pseudosinhalite", a new hydrous MgAl-borate: synthesis, phase characterization, crystal structure, and PT-stability Contributions to Mineralogy and Petrology 128 261-271 | 1997 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.14 Å | (100) |
| 1.625 Å | (100) |
| 2.102 Å | (60) |
| 3.21 Å | (40) |
| 2.61 Å | (40) |
| 1.607 Å | (40) |
| 1.399 Å | (40) |
Comments:
Tayezhnoe Fe-B skarn, Russia. The data are from Schreyer et al. (1998).
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) |
Type Occurrence of Pseudosinhalite
Place of Conservation of Type Material:
Institut für Mineralogie, Ruhr-Universität Bochum, Germany.
Geological Setting of Type Material:
As a replacement product of sinhalite, in an impure marble at the contact of a metasomatic iron boron deposit.
Associated Minerals at Type Locality:
Synonyms of Pseudosinhalite
Other Language Names for Pseudosinhalite
Common Associates
Associated Minerals Based on Photo Data:
| 7 photos of Pseudosinhalite associated with Spinel | MgAl2O4 |
| 4 photos of Pseudosinhalite associated with Geikielite | MgTiO3 |
| 2 photos of Pseudosinhalite associated with Magnesiotaaffeite-6N’3S | Mg2BeAl6O12 |
Related Minerals - Strunz-mindat Grouping
| 6.AC.05 | Sinhalite | MgAl(BO4) |
| 6.AC.15 | Béhierite | (Ta5+,Nb5+)(BO4) |
| 6.AC.15 | Schiavinatoite | (Nb,Ta)(BO4) |
| 6.AC.20 | Frolovite | Ca[B(OH)4]2 |
| 6.AC.25 | Hexahydroborite | Ca[B(OH)4]2 · 2H2O or CaB2O4 · 6H2O |
| 6.AC.30 | Henmilite | Ca2Cu[B(OH)4]2(OH)4 |
| 6.AC.35 | Bandylite | Cu[B(OH)4]Cl |
| 6.AC.40 | Teepleite | Na2[B(OH)4]Cl |
| 6.AC.45 | Moydite-(Y) | Y[B(OH)4](CO3) |
| 6.AC.50 | Carboborite | Ca2Mg[B(OH)4]2(CO3)2 · 4H2O |
| 6.AC.55 | Sulfoborite | Mg3[B(OH)4]2(SO4)(OH,F)2 |
| 6.AC.60 | Lüneburgite | Mg3[B2(OH)6](PO4)2 · 6H2O |
| 6.AC.65 | Seamanite | Mn2+3[B(OH)4](PO4)(OH)2 |
| 6.AC.70 | Cahnite | Ca2[B(OH)4](AsO4) |
Fluorescence of Pseudosinhalite
Not fluorescent.
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 Pseudosinhalite
mindat.org URL:
https://www.mindat.org/min-7257.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Pseudosinhalite
Reference List:
Localities for Pseudosinhalite
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.
Austria | |
| Bernhard et al. (2008) |
Russia (TL) | |
| Schreyer et al. (1998) +1 other reference |
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Stubenberg Quarry, Stubenberg am See, Hartberg-Fürstenfeld District, Styria, Austria