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Pseudosinhalite

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About PseudosinhaliteHide

Formula:
Mg2Al3(BO3)2(OH)O3
Colour:
Colourless
Lustre:
Vitreous
Crystal System:
Monoclinic
Name:
The name alludes to the optical, chemical, and structural similarity to sinhalite.
This page provides mineralogical data about Pseudosinhalite.


Classification of PseudosinhaliteHide

Approved
Approval Year:
1997
6.AC.10

6 : BORATES
A : Monoborates
C : B(O,OH)4, without and with additional anions; 1(T), 1(T)+OH, etc

Physical Properties of PseudosinhaliteHide

Vitreous
Transparency:
Transparent
Colour:
Colourless

Optical Data of PseudosinhaliteHide

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.
Surface Relief:
High
Dispersion:
r > v or r < v

Chemical Properties of PseudosinhaliteHide

Formula:
Mg2Al3(BO3)2(OH)O3
IMA Formula:
Mg2Al3B2O9(OH)

Crystallography of PseudosinhaliteHide

Crystal System:
Monoclinic

Type Occurrence of PseudosinhaliteHide

Place of Conservation of Type Material:
Institut für Mineralogie, Ruhr-Universität Bochum, Germany.

Synonyms of PseudosinhaliteHide

Other Language Names for PseudosinhaliteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
7 photos of Pseudosinhalite associated with SpinelMgAl2O4
4 photos of Pseudosinhalite associated with GeikieliteMgTiO3
2 photos of Pseudosinhalite associated with Magnesiotaaffeite-6N’3SMg2BeAl6O12

Related Minerals - Nickel-Strunz GroupingHide

6.AC.05SinhaliteMgAl(BO4)Orth. mmm (2/m 2/m 2/m) : Pnma
6.AC.15Béhierite(Ta5+,Nb5+)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.15Schiavinatoite(Nb,Ta)(BO4)Tet. 4/mmm (4/m 2/m 2/m) : I41/amd
6.AC.20FroloviteCa[B(OH)4]2Tric.
6.AC.25HexahydroboriteCa[B(OH)4]2 · 2H2O or CaB2O4 · 6H2OMon. 2/m : B2/b
6.AC.30HenmiliteCa2Cu[B(OH)4]2(OH)4Tric.
6.AC.35BandyliteCu[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.40TeepleiteNa2[B(OH)4]ClTet. 4/mmm (4/m 2/m 2/m) : P4/nmm
6.AC.45Moydite-(Y)Y[B(OH)4](CO3)Orth. mmm (2/m 2/m 2/m) : Pbca
6.AC.50CarboboriteCa2Mg[B(OH)4]2(CO3)2 · 4H2OMon.
6.AC.55SulfoboriteMg3[B(OH)4]2(SO4)(OH,F)2Orth. mm2
6.AC.60LüneburgiteMg3[B2(OH)6](PO4)2 · 6H2OTric.
6.AC.65SeamaniteMn2+3[B(OH)4](PO4)(OH)2Orth. mmm (2/m 2/m 2/m)
6.AC.70CahniteCa2[B(OH)4](AsO4)Tet. 4 : P4

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for PseudosinhaliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).
Daniels, P., Krosse, S., Werding, G., and Schreyer, W. (1997) "Pseudosinhalite", a new hydrous MgAl-borate: synthesis, phase characterization, crystal structure, and P-T stability. Contributions to Mineralogy and Petrology: 128: 261-271.
Schreyer, W., Pertsev, N.N., Medenbach, O., Burchard, M., and Dettmar, D. (1998) Pseudosinhalite: discovery of the hydrous MgAl-borate as a new mineral in the Tayozhnoye, Siberia, skarn deposit. Contributions to Mineralogy and Petrology: 133: 382-388.
Jambor, J.L., Pertsev, N.N., and Roberts, A.C. (1999) New mineral names. American Mineralogist: 84: 1195-1198.
Strunz, H. and Nickel, E. (2000) Pseudosinhalite is a structural isotype of chondrodite. American Mineralogist: 85: 1828-1829.
Daniels, P. and Schreyer, W. (2001) Comments on: Strunz and Nickel: Pseudosinhalite is a structural isotype of chondrodite. American Mineralogist: 86: 583-584.
Bernhard, F., Hauzenberger, C., Walter, F., and Kristiansen, R. (2008) Pseudosinhalite, magnesiotaaffeite-6N´3S and magnesiotaaffeite-2N´2S as replacement products of spinel in dolomite marble from Stubenberg, Styria, Austria. Canadian Mineralogist: 46: 1195-1205.

Internet Links for PseudosinhaliteHide

Localities for PseudosinhaliteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Austria
 
  • Styria
    • Weiz
      • Stubenberg am See
Bernhard, F., Hauzenberger, Ch., Walter, F. & Kristiansen, R. (2008): Pseudosinhalite, magnesiotaaffeite-6N´3S and magnesiotaaffeite-2N´2S as replacement products of spinel in dolomite marble from Stubenberg, Styria, Austria. Canadian Mineralogist, 46, 1195-1205
Russia (TL)
 
  • Sakha Republic (Yakutia)
    • Aldan Shield
      • Aldan
Schreyer, W., Pertsev, N.N., Medenbach, O., Burchard, M., and Dettmar, D. (1998) Pseudosinhalite: discovery of the hydrous MgAl-borate as a new mineral in the Tayozhnoye, Siberia, skarn deposit. Contributions to Mineralogy and Petrology: 133: 382-388.; Jambor, J.L., Pertsev, N.N., and Roberts, A.C. (1999) New mineral names. American Mineralogist: 84: 1195-1198.
 
Mineral and/or Locality  
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