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Sphaerobertrandite

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Formula:
Be3(SiO4)(OH)2
System:
Monoclinic
Colour:
Colourless, white, ...
Hardness:
5
Name:
After typical spherulitic morphology and chemical similarity to Bertrandite. The mineral was first described by Semenov in 1957, but was not accepted as a valid species. The IMA finally approved the mineral in 2003.
This page provides mineralogical data about Sphaerobertrandite.

Classification of Sphaerobertrandite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" 2003
9.AE.50

9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
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First Recorded Occurrence of Sphaerobertrandite

General Appearance of First Recorded Material:
Compact spherulites and aggregates, finely crystalline crusts and spherulites.
Year of Discovery:
1957

Occurrences of Sphaerobertrandite

Geological Setting:
Alkaline pegmatites

Physical Properties of Sphaerobertrandite

Vitreous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Colourless, white, yellow, brownish, greyish, beige.
Streak:
White
Hardness (Mohs):
5
Tenacity:
Brittle
Cleavage:
Perfect
(001)
Density:
2.46 - 2.54 g/cm3 (Measured)    2.52 g/cm3 (Calculated)

Crystallography of Sphaerobertrandite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 5.081Å, b = 4.639Å, c = 17.664Å
β = 106.09°
Ratio:
a:b:c = 1.095 : 1 : 3.808
Unit Cell Volume:
V 400 ų
Morphology:
Main crystal form is {001}, small faces {012}, {102} and {10-2} are present.
Twinning:
Invariably twinned by pseudo-merohedry probably due to strongly pseudo-orthorhombic cell.
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.885(90)
4.236(62)
3.161(100)
11_3)(
2.836(70)
2.538(55)
2.318(90)
2.174(55)

Optical Data of Sphaerobertrandite

Type:
Biaxial (-)
RI values:
nα = 1.597 nβ = 1.607 nγ = 1.616
2V:
Measured: 50° to 90°
Max Birefringence:
δ = 0.019
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Sphaerobertrandite

Formula:
Be3(SiO4)(OH)2
Essential elements:
All elements listed in formula:
Analytical Data:
From Sengischorr Mt.
BeO (45.88)
SiO2(38.46)
H2O (12.54)

Total: 96.88 wt. %
Empirical Formula:
Be2.97Si1.03O4.06(OH)1.94 · 0.155H2O ·

Relationship of Sphaerobertrandite to other Species

9.AE.05BerylliteBe3(SiO4)(OH)2 · H2O
9.AE.10EuclaseBeAl(SiO4)(OH)
9.AE.15SverigeiteNaMnMgSnBe2(SiO4)3(OH)
9.AE.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2
9.AE.25GerstmanniteMnMgZn(SiO4)(OH)2
9.AE.30ClinohedriteCaZn(SiO4) · H2O
9.AE.35StringhamiteCaCu(SiO4) · H2O
9.AE.40Katoptrite(Mn2+,Mg)13(Al,Fe3+)4Sb25+(SiO4)2O20
9.AE.45YeatmaniteZn6Mn92+Sb25+(SiO4)4O12

Other Names for Sphaerobertrandite

Name in Other Languages:

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.

References for Sphaerobertrandite

Reference List:
Pekov, I.V., Chukanov, N. V., Larsen, A.O., Merlino, S.,Pasero, M., Pushcharovsky, D.Y., Ivaldi, G., Zadov, A.E., Grishin, V. G., Åsheim, A., Taftø, J. & Chistyakova, N.I. (2003): Sphaerobertrandite, Be3SiO4(OH)2: new data, crystal structure and genesis. European Journal of Mineralogy. 15: 157-166.

Internet Links for Sphaerobertrandite

Localities for Sphaerobertrandite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
China
 
  • Hunan Province
    • Chenzhou Prefecture
      • Linwu Co.
        • Xianghualing Sn-polymetallic ore field
Xihuan Zhang and Yufeng Ren (2008): Acta Petrologica et Mineralogica 27(2), 135-151
Greenland
 
  • Kujalleq
    • Narsaq
http://www.mineralogicalassociation.ca/doc/Sphaerobertrandite.pdf; Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33
Norway
 
  • Telemark
    • Porsgrunn
      • Mørje
Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 pp
  • Vestfold
    • Larvik
      • Tvedalen
Pekov, I.V., Chukanov, N. V., Larsen, A.O., Merlino, S.,Pasero, M., Pushcharovsky, D.Y., Ivaldi, G., Zadov, A.E., Grishin, V. G., Åsheim, A., Taftø, J. & Chistyakova, N.I. (2003): Sphaerobertrandite, Be3SiO4(OH)2: new data, crystal structure and genesis. European Journal of Mineralogy. 15: 157-166
Eur. J, Mineral. 15,157-166 (2003); Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 pp
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
http://www.mineralogicalassociation.ca/doc/Sphaerobertrandite.pdf
        • Lovozero Massif
http://www.mineralogicalassociation.ca/doc/Sphaerobertrandite.pdf
http://www.mineralogicalassociation.ca/doc/Sphaerobertrandite.pdf
          • Seidozero Lake
http://www.mineralogicalassociation.ca/doc/Sphaerobertrandite.pdf
Pekov, I.V., Chukanov, N. V., Larsen, A.O., Merlino, S.,Pasero, M., Pushcharovsky, D.Y., Ivaldi, G., Zadov, A.E., Grishin, V. G., Åsheim, A., Taftø, J. & Chistyakova, N.I. (2003): Sphaerobertrandite, Be3SiO4(OH)2: new data, crystal structure and genesis. European Journal of Mineralogy. 15: 157-166
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