Mindat Logo

Sphaerobertrandite

This page is currently not sponsored. Click here to sponsor this page.



Formula:
Be
 
3
(SiO
 
4
)(OH)
 
2
System:MonoclinicColour: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

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" 2003
Strunz 9th edition ID:9.AE.50
Nickel-Strunz 10th (pending) edition ID:9.AE.50

9 : SILICATES (Germanates)
A : Nesosilicates
E : Nesosilicates with additional anions (O,OH,F,H2O); cations in tetrahedral [4] coordination
mindat.org URL:http://www.mindat.org/min-11337.html
Please feel free to link to this page.

Type Occurrence of Sphaerobertrandite

Co-type Localities:Tuften (Tuften 1 Quarry; Tuften 2 Quarry), Tvedalen, Larvik, Vestfold, Norway
Sengischorr Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
General Appearance of Type 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

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

Crystallography of Sphaerobertrandite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
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:
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°
Maximum Birefringence:δ = 0.019

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

Chemical Properties of Sphaerobertrandite

Formula:
Be
 
3
(SiO
 
4
)(OH)
 
2
Simplified for copy/paste:Be3(SiO4)(OH)2
Essential elements:Be, H, O, Si
All elements listed in formula:Be, H, O, Si
Analytical Data:From Sengischorr Mt.
BeO (45.88)
SiO2(38.46)
H2O (12.54)

Total: 96.88 wt. %
Empirical Formula:
Be
 
2.97
Si
 
1.03
O
 
4.06
(OH)
 
1.94
· 0.155H
 
2
O ·

Relationship of Sphaerobertrandite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AE.05Beryllite
Be
 
3
(SiO
 
4
)(OH)
 
2
· H
 
2
O
9.AE.10Euclase
BeAl(SiO
 
4
)(OH)
9.AE.15Sverigeite
NaMnMgSnBe
 
2
(SiO
 
4
)
 
3
(OH)
9.AE.20Hodgkinsonite
Mn
2+
 
Zn
 
2
(SiO
 
4
)(OH)
 
2
9.AE.25Gerstmannite
MnMgZn(SiO
 
4
)(OH)
 
2
9.AE.30Clinohedrite
CaZn(SiO
 
4
) · H
 
2
O
9.AE.35Stringhamite
CaCu(SiO
 
4
) · H
 
2
O
9.AE.40Katoptrite
(Mn
2+
 
,Mg)
 
13
(Al,Fe
3+
 
)
 
4
Sb
5+
2
(SiO
 
4
)
 
2
O
 
20
9.AE.45Yeatmanite
Zn
 
6
Mn
2+
9
Sb
5+
2
(SiO
 
4
)
 
4
O
 
12

Other Names for Sphaerobertrandite

Other Languages:
German:Sphaerobertrandit
Russian:Сферобертрандит
Simplified Chinese:球羟硅铍石
Spanish:Sphaerobertrandita
Traditional Chinese:球羥矽鈹石

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 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

Search Engines:
  • Look for Sphaerobertrandite on Google
  • Look for Sphaerobertrandite images on Google
  • External Links:
  • Look for Sphaerobertrandite on Webmineral
  • Look for Sphaerobertrandite on Athena Mineralogy
  • Look for Sphaerobertrandite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mineral Dealers:
  • Buy RARE Minerals from Rocks of Africa
  • High-end worldwide specimens & outstanding customer service
  • Fine and rare minerals from mintreasure.com
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Find Sphaerobertrandite on www.crystalclassics.co.uk
  • The Arkenstone - Fine Minerals
  • Fine Minerals from Weinrich Minerals, Inc.
  • Wilensky Fine Minerals
  • Search for Sphaerobertrandite on Well-Arranged Molecules
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • Fabre Minerals - search for Sphaerobertrandite specimens
  • Fine minerals from bisbeeborn.com
  • Localities for Sphaerobertrandite

    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.
    (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.
    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
    Mineral and/or Locality  
    Search Google  
    Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: May 3, 2014 22:59:35
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds