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Boralsilite

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Big Photo

Stornes Peninsula, Larsemann Hills (Larseman Hills), Prydz Bay, Ingrid Christensen Coast, Princess Elizabeth Land, Eastern Antarctica, Antarctica
© R.Kristiansen




Formula:
Al
 
16
B
 
6
Si
 
2
O
 
27
System:MonoclinicLustre:Vitreous
Name:Named after its composition, containing BORon, ALuminum, and SILicon.
This page provides mineralogical data about Boralsilite.

Classification of Boralsilite

IMA status:Approved
Strunz 8th edition ID:8/B.31-45
Nickel-Strunz 10th (pending) edition ID:9.BD.30

9 : SILICATES (Germanates)
B : Sorosilicates
D : Si2O7 groups, with additional anions; cations in tetrahedral [4] and greater coordination
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Type Occurrence of Boralsilite

Type Locality:Stornes Peninsula, Larsemann Hills (Larseman Hills), Prydz Bay, Ingrid Christensen Coast, Princess Elizabeth Land, Eastern Antarctica, Antarctica

Physical Properties of Boralsilite

Lustre:Vitreous

Crystallography of Boralsilite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:B2/m {B1 1 2/m} {C2/m} {C1 2/m 1}
Space Group Setting:C2/m
Cell Parameters:a = 14.767Å, b = 5.574Å, c = 15.079Å
β = 91.96°
Ratio:a:b:c = 2.649 : 1 : 2.705
Unit Cell Volume:V 1,240.45 ų (Calculated from Unit Cell)

Optical Data of Boralsilite

Type:Biaxial (+)
RI values: nα = 1.629 nβ = 1.640 nγ = 1.654
2V:Measured: 81° , Calculated: 84°
Maximum Birefringence:δ = 0.025

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Moderate
Dispersion:very weak

Chemical Properties of Boralsilite

Formula:
Al
 
16
B
 
6
Si
 
2
O
 
27
Essential elements:Al, B, O, Si
All elements listed in formula:Al, B, O, Si

Relationship of Boralsilite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.BD.05Bertrandite
Be
 
4
(Si
 
2
O
 
7
)(OH)
 
2
9.BD.10Hemimorphite
Zn
 
4
Si
 
2
O
 
7
(OH)
 
2
 · H
 
2
O
9.BD.15Junitoite
CaZn
 
2
Si
 
2
O
 
7
 · H
 
2
O
9.BD.20Axinite-(Fe)
Ca
 
2
Fe
2+
 
Al
 
2
BSi
 
4
O
 
15
OH
9.BD.20Axinite-(Mg)
Ca
 
2
MgAl
 
2
BSi
 
4
O
 
15
OH
9.BD.20Axinite-(Mn)
Ca
 
2
Mn
2+
 
Al
 
2
BSi
 
4
O
 
15
(OH)
9.BD.20Tinzenite
(Ca,Mn
2+
 
,Fe
2+
 
)
 
6
Al
 
4
(B
 
2
Si
 
8
O
 
30
)(OH)
 
2
9.BD.25Vistepite
SnMn
 
4
B
 
2
Si
 
4
O
 
16
(OH)
 
2
9.BD.35Werdingite
(Mg,Fe)
 
2
Al
 
14
Si
 
4
B
 
4
O
 
37

Other Names for Boralsilite

Synonyms:
IMA1996-029
Other Languages:
German:Boralsilit
Russian:Боралсилит
Spanish:Boralsilita

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 Boralsilite

Reference List:

- +
Edward S. Grew, Heribert A. Graetsch, Birgit Pöter, Martin G. Yates, Ian Buick, Heinz-Jürgen Bernhardt, Werner Schreyer, Günter Werding, Christopher J. Carson, and Geoffrey L. Clarke (2008) Boralsilite, Al16B6Si2O37, and “boron-mullite:” Compositional variations and associated phases in experiment and nature. American Mineralogist 93:283-299

Grew, E.S., McGee, J.J., Yates, M.G., Peacor, D.R., Rouse, R.C., Huijsmans, J.P.P., Shearer, C.K., Wiedenbeck, M., Thost, D.E., and Su, S.-C. (1998) Boralsilite (Al16B6Si2O37): A new mineral related to sillimanite from pegmatites in granulite-facies rocks. American Mineralogist: 83: 638-651.

Pöter, B., Werding, G., Schreyer, W., Bernhardt, H.-J. (1998) Synthesis and properties of the new borosilicate mineral boralsilite. Berichte Deutschen Mineral Gesell, Beiheft z European Journal of Mineralogy: 10(1): 220.

American Mineralogist (1999): 84: 1152-1161.

Internet Links for Boralsilite

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    • Localities for Boralsilite

    The 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.
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    (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.
    Antarctica
     
    • Eastern Antarctica
      • Princess Elizabeth Land
        • Ingrid Christensen Coast
          • Prydz Bay
            • Larsemann Hills (Larseman Hills)
    		Grew, E. S. et al. (1998): Boralsilite (Al16B6Si2O37); a new mineral related to sillimanite from pegmatites in granulite-facies rocks . American Mineralogist 83: 638-651
    Norway
     
    • Rogaland
      • Lund
        • Flatestøl
    		Grew, E. S. et al. (1998): Boralsilite (Al 16 B 6 Si 2 O 37 ); a new mineral related to sillimanite from pegmatites in granulite-facies rocks . American Mineralogist 83: 638-651
    Mineral and/or Locality
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