![]() |
Sphaerobertrandite Mineral Data |
General Sphaerobertrandite Information |
|||
![]() |
Be3SiO4(OH)2 | ||
![]() |
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 | |||
![]() |
Be2.89Si1.01O3.81(OH)2.19 | ||
![]() |
Found in Be-bearing pegmatites and greisens. Originally named in 1957 and revalidated in 2003. | ||
![]() |
Valid Species (Pre-IMA) 1957 (Dana # Added) | ||
![]() |
Mannepakhk Mountain,Lovozero massif, Russia. Link to MinDat.org Location Data. | ||
![]() |
The name alludes to the typical spherulitic morphology and the similarity to bertrandite in the main chemical constituents. | ||
![]() |
Sphaerobertrandite + Pronunciation ![]() |
||
Sphaerobertrandite Image | |||
![]() |
|
||
Sphaerobertrandite Crystallography |
|||
![]() |
a:b:c =1.0952:1:3.8077 | ||
![]() |
a = 5.081, b = 4.639, c = 17.664, Z = 4; beta = 106.09° V = 400.04 Den(Calc)= 2.53 | ||
![]() |
Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 2 | ||
![]() |
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 |
|||
![]() |
{001} Perfect, {010} Distinct | ||
![]() |
Colorless, Yellow, Brownish white, White, Gray. | ||
![]() |
2.46 - 2.54, Average = 2.5 | ||
![]() |
Transparent to Translucent | ||
![]() |
Brittle - Uneven - Very brittle fracture producing uneven fragments. | ||
![]() |
Platy - Sheet forms (e.g. micas). | ||
![]() |
Spherical - Spherical, rounded aggregates. | ||
![]() |
5 - Apatite | ||
![]() |
Vitreous (Glassy) | ||
![]() |
white | ||
Optical Properties of Sphaerobertrandite |
|||
![]() |
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 |
||
![]() |
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 |
|||
![]() |
Bulk Density (Electron Density)=2.52 gm/cc note: Specific Gravity of Sphaerobertrandite =2.53 gm/cc. |
||
![]() |
Fermion Index = 0.17 Boson Index = 0.83 |
||
![]() |
PESphaerobertrandite = 0.91 barns/electron U=PESphaerobertrandite x rElectron Density= 2.29 barns/cc. |
||
![]() |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Sphaerobertrandite is Not Radioactive |
||
Sphaerobertrandite Classification |
|||
![]() |
52.01.02.01 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O | ||
(52.01)with cations in [4] coordination | |||
(52.01.02)Dana Group | |||
![]() |
09.AE.50 09 - SILICATES (Germanates) | ||
09.A - Nesosilicates | |||
09.AE -Nesosilicates with additional (O,OH,F,H2O); | |||
Other Sphaerobertrandite Information |
|||
![]() |
NAME( AmMin, v 88, p 1839) PHYS. PROP.(AmMin, v 88, p 1839) OPTIC PROP.(AmMin, v 88, p 1839) | ||
![]() |
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 Search for Sphaerobertrandite using: Visit our Advertisers for Sphaerobertrandite : Ask about Sphaerobertrandite here : Print or Cut-and-Paste your Sphaerobertrandite Specimen Label here :
|
||
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.