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Sphaerobertrandite

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Formula:
Be3(SiO4)(OH)2
Colour:
Colourless, white, yellow, brownish, greyish, beige.
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
2.46 - 2.54
Crystal System:
Monoclinic
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.


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Classification of SphaerobertranditeHide

Approved, 'Grandfathered' (first described prior to 1959)
First Published:
2003
9.AE.50

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

Physical Properties of SphaerobertranditeHide

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

Optical Data of SphaerobertranditeHide

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 SphaerobertranditeHide

Formula:
Be3(SiO4)(OH)2
IMA Formula:
Be3SiO4(OH)2

Crystallography of SphaerobertranditeHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 5.081 Å, b = 4.639 Å, c = 17.664 Å
β = 106.09°
Ratio:
a:b:c = 1.095 : 1 : 3.808
Unit Cell 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 DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.885(90)
4.236(62)
3.161(100)
2.836(70)
2.538(55)
2.318(90)
2.174(55)

Type Occurrence of SphaerobertranditeHide

General Appearance of Type Material:
Compact spherulites and aggregates, finely crystalline crusts and spherulites.

Other Language Names for SphaerobertranditeHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Hambergite7 photos of Sphaerobertrandite associated with Hambergite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.AE.05BerylliteBe3(SiO4)(OH)2 · H2OOrth.
9.AE.10EuclaseBeAl(SiO4)(OH)Mon. 2/m : P21/b
9.AE.15SverigeiteNaMnMgSnBe2(SiO4)3(OH)Orth. mmm (2/m 2/m 2/m) : Imma
9.AE.20HodgkinsoniteMn2+Zn2(SiO4)(OH)2Mon.
9.AE.25GerstmanniteMnMgZn(SiO4)(OH)2Orth.
9.AE.30ClinohedriteCaZn(SiO4) · H2OMon. m : Bb
9.AE.35StringhamiteCaCu(SiO4) · H2OMon.
9.AE.40Katoptrite(Mn2+,Mg)13(Al,Fe3+)4Sb5+2(SiO4)2O20Mon. 2/m : B2/m
9.AE.45YeatmaniteZn6Mn2+9Sb5+2(SiO4)4O12Tric.

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 SphaerobertranditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 SphaerobertranditeHide

Localities for SphaerobertranditeHide

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.
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
        • Kangerluarsuk Fjord (Kangerdluarssuq Fjord)
Семёнов, Е.И. (1969). Минералогия щелочного массива Илимаусак (Южная Гренландия). Москва : Издательсво "Наука". 165 pp. [Semyonov, E.I. Mineralogy of the Ilimaussaq alkaline massive]
Norway
 
  • Telemark
    • Porsgrunn
      • Mørje
Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 pp
  • Vestfold
    • Larvik
      • Tjølling
        • Klåstad
Larsen, K.E. & Stensvold, B.K.(2015): Berylliummineraler og andre sjeldne mineraler i syenittpegmatitter i Skallist larvikittbrudd, Tjølling, Larvik, Vestfold. Norsk Mineralsymposium 2015, 47-56
      • Tvedalen
Jens Andreas Larsen find, Roy Kristiansen collection; Larsen, A.O.(2015): A new find of sphaerobertrandite from the Larvik Plutonic Complex, Norway, Aust-Agder. Norsk Mineralsymposium 2015, 45-46
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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