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Sphaerobertrandite Mineral Data

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General Sphaerobertrandite Information

Help on Chemical  Formula: Chemical Formula: Be3SiO4(OH)2
Help on Composition: Composition: Molecular Weight = 152.62 gm
   Beryllium  17.07 %  Be   47.36 % BeO
   Silicon    18.59 %  Si   39.76 % SiO2
   Hydrogen    1.45 %  H    12.93 % H2O
   Oxygen     62.90 %  O
             ______        ______ 
             100.00 %      100.05 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Be2.89Si1.01O3.81(OH)2.19
Help on Environment: Environment: Found in Be-bearing pegmatites and greisens. Originally named in 1957 and revalidated in 2003.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1957 (Dana # Added)
Help on Locality: Locality: Mannepakhk Mountain,Lovozero massif, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: The name alludes to the typical spherulitic morphology and the similarity to bertrandite in the main chemical constituents.
Help on Name Pronunciation: Name Pronunciation: Sphaerobertrandite + Pronunciation Say SPHAEROBERTRANDITE

Sphaerobertrandite Image

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Comments: White to pale brownish, radial-concentric aggregates of sphaerobertrandite.
Location: Sengischorr Mt, Lovozero Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Sphaerobertrandite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0952:1:3.8077
Help on Cell Dimensions: Cell Dimensions: a = 5.081, b = 4.639, c = 17.664, Z = 4; beta = 106.09° V = 400.04 Den(Calc)= 2.53
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 2
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.161(1)(111,113), 2.318(0.9)(020), 4.885(0.9)(100),2.836(0.7)(104), 4.236(0.62)(004),

Physical Properties of Sphaerobertrandite

Help on Cleavage: Cleavage: {001} Perfect, {010} Distinct
Help on Color: Color: Colorless, Yellow, Brownish white, White, Gray.
Help on Density: Density: 2.46 - 2.54, Average = 2.5
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Hardness: Hardness: 5 - Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Sphaerobertrandite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.01 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2398,KPDmeas= 0.2427,KC= 0.2403
Ncalc = 1.59 - 1.61
Help on Optical Data: Optical Data: Biaxial (-), a=1.597, b=1.607, g=1.616, bire=0.0190, 2V(Calc)=86, 2V(Meas)=86.5. Dispersion none.

Calculated Properties of Sphaerobertrandite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.52 gm/cc
note: Specific Gravity of Sphaerobertrandite =2.53 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.17
Boson Index = 0.83
Help on Photoelectric: Photoelectric: PESphaerobertrandite = 0.91 barns/electron
U=PESphaerobertrandite x rElectron Density= 2.29 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Sphaerobertrandite is Not Radioactive

Sphaerobertrandite Classification

Help on  Dana Class: Dana Class: (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.01)with cations in [4] coordination
  (52.01.02)Dana Group Sphaerobertrandite! Be3SiO4(OH)2 P 2 2
Help on  Strunz Class: Strunz Class: 09.AE.50 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AE -Nesosilicates with additional (O,OH,F,H2O);
09.AE.50 Sphaerobertrandite Be3SiO4(OH)2 P 2 2

Other Sphaerobertrandite Information

Help on References: References: NAME( AmMin, v 88, p 1839) PHYS. PROP.(AmMin, v 88, p 1839) OPTIC PROP.(AmMin, v 88, p 1839)
Help on See Also: See Also: Links to other databases for Sphaerobertrandite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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Dana No: Strunz No: 09.AE.50





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