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Bertrandite Mineral Data + |
General Bertrandite Information |
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| Be4Si2O7(OH)2 | |||
| Molecular Weight = 238.23 gm | |||
| Beryllium 15.13 % Be 42.00 % BeO | |||
| Silicon 23.58 % Si 50.44 % SiO2 | |||
| Hydrogen 0.85 % H 7.56 % H2O | |||
| Oxygen 60.44 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Be4(Si2O7)(OH)2 | |||
| Commonly found in Be-bearing pegmatites and may be derived from the alteration of beryl. | |||
| Valid Species (Pre-IMA) 1883 | |||
| Discovered at near Nantes, Loire-Inferieure, France. Also found at Irkutka and Altai Mountains, Siberia, Russia. Link to MinDat.org Location Data. | |||
| Named after the French mineralogist, E. Bertrand. | |||
| ICSD 202360 | |||
| PDF 24-509 | |||
Bertrandite Image | |||
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Bertrandite Crystallography |
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| a:b:c =1.7514:1:0.5224 | |||
| a = 15.22, b = 8.69, c = 4.54, Z = 4; V = 600.47 Den(Calc)= 2.64 | |||
| Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: Ccm21 | |||
| By Intensity(I/Io): 4.38(1), 3.19(0.9), 2.54(0.8), | |||
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Physical Properties of Bertrandite |
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| [001] Perfect, [110] Distinct, [101] Distinct | |||
| Colorless, Pale yellow. | |||
| 2.59 - 2.6, Average = 2.59 | |||
| Translucent to transparent | |||
| Brittle - Generally displayed by glasses and most non-metallic minerals. | |||
| Crystalline - Fine - Occurs as well-formed fine sized crystals. | |||
| Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | |||
| Tabular - Form dimensions are thin in one direction. | |||
| 6-7 - Orthoclase-Quartz | |||
| None. | |||
| Vitreous (Glassy) | |||
| Nonmagnetic | |||
| white | |||
Optical Properties of Bertrandite |
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| CI meas= -0.005 (Superior) - where the CI = (1-KPDmeas/KC) CI calc= 0.012 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2285,KPDmeas= 0.2325,KC= 0.2314 |
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| Biaxial (-), a=1.591, b=1.605, g=1.614, bire=0.0230, 2V(Calc)=76, 2V(Meas)=73-81. Dispersion none. | |||
| none. | |||
| none. | |||
| none. | |||
Calculated Properties of Bertrandite |
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relectron=2.57 gm/cc |
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| Fermion Index = 0.16262 Boson Index = 0.83738 |
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PEBertrandite = 1.07 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Bertrandite is Not Radioactive |
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Bertrandite Classification |
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| 56.1.1.1 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O | |||
| (56.1)with cations in [4] coordination | |||
| (56.1.1)Dana Group | |||
| VIII/C.07-10 VIII - Silicates | |||
| VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F] | |||
| VIII/C.07 - Bertrandite - Strontiochevkinite series | |||
Other Bertrandite Information |
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| NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | |||
| Links to other databases for Bertrandite : 1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 -Athena 4 - Crocoite.com Mineral Locations 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 - Minerals of Wisconsin 15 -QUT Mineral Atlas 16 - Scandinavian mineral gallery 17 - WWW-MINCRYST 18 -École des Mines de Paris Search for Bertrandite using: Visit our Advertisers for Bertrandite : Translate Bertrandite Mineral Data : Ask about Bertrandite here : Print or Cut-and-Paste your Bertrandite Specimen Label here :
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