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Pseudosinhalite

Formula:
Mg
 
2
Al
 
3
[O
 
3
|OH|(BO
 
3
)
 
2
]
System:MonoclinicColour:Colourless
Lustre:Vitreous
Name:The name alludes to the optical, chemical, and structural similarity to Sinhalite
This page provides mineralogical data about Pseudosinhalite.

Classification of Pseudosinhalite

IMA status:Approved 1997
Strunz 8th edition ID:5/G.07-12
Nickel-Strunz 10th (pending) edition ID:6.AC.10

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

Type Locality:Tayezhnoe (Tayozhnoye) Fe-B skarn, Aldan Shield, Saha Republic (Sakha Republic; Yakutia), Eastern-Siberian Region, Russia

Physical Properties of Pseudosinhalite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Colourless

Crystallography of Pseudosinhalite

Crystal System:Monoclinic

Optical Data of Pseudosinhalite

Type:Biaxial (-)
RI values: nα = 1.691 nβ = 1.713 nγ = 1.730
Maximum Birefringence:δ = 0.039

Chart 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 Pseudosinhalite

Formula:
Mg
 
2
Al
 
3
[O
 
3
|OH|(BO
 
3
)
 
2
]
Essential elements:Al, B, H, Mg, O
All elements listed in formula:Al, B, H, Mg, O

Relationship of Pseudosinhalite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
6.AC.05Sinhalite
MgAl[O|BO
 
3
]
6.AC.15Behierite
(Ta
5+
 
,Nb
5+
 
)[O|BO
 
3
]
6.AC.15Schiavinatoite
(Nb,Ta)BO
 
4
6.AC.20Frolovite
Ca[B(OH)
 
4
]
 
2
6.AC.25Hexahydroborite
Ca[B(OH)
 
4
]
 
2
 · 6H
 
2
O
6.AC.30Henmilite
Ca
 
2
Cu[(OH)
 
2
|B(OH)
 
4
]
 
2
6.AC.35Bandylite
Cu[Cl|B(OH)
 
4
]
6.AC.40Teepleite
Na
 
2
[Cl|B(OH)
 
4
]
6.AC.45Moydite-(Y)
Y[CO
 
3
|B(OH)
 
4
]
6.AC.50Carboborite
Ca
 
2
Mg[CO
 
3
|B(OH)
 
4
]
 
2
 · 4H
 
2
O
6.AC.55Sulfoborite
Mg
 
3
[(OH,F)
 
2
|SO
 
4
|{B(OH)
 
4
}
 
2
]
6.AC.60Lüneburgite
Mg
 
3
B
 
2
(PO
 
4
)
 
2
(OH)
 
6
·6H
 
2
O
6.AC.65Seamanite
Mn
2+
3
[(OH)
 
2
|PO
 
4
|B(OH)
 
4
]
6.AC.70Cahnite
Ca
 
2
[AsO
 
4
|B(OH)
 
4
]

Other Names for Pseudosinhalite

Synonyms:
IMA1997-014
Other Languages:
German:Pseudosinhalit
Russian:Псевдосинхалит
Spanish:Pseudosinhalita

Other Information

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

References for Pseudosinhalite

Reference List: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., 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 (1998): 133: 382-388.

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.

Grew, E.S., and Anovitz, L.M. (1996) BORON: Mineralogy, Petrology and Geochemistry, second edition, as revised (2002).

Articles/Blogs about Pseudosinhalite

Internet Links for Pseudosinhalite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Pseudosinhalite in the Natural History Museum (London) online catalogue
  • Pseudosinhalite details from Handbook of Mineralogy (PDF)
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    Localities for Pseudosinhalite

    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Russia
     
    • Eastern-Siberian Region
      • Saha Republic (Sakha Republic; Yakutia)
        • Aldan Shield
    		Schreyer et al (1998), Contributions to Mineralogy and Petrology: 133: 382-388.
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