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Bertrandite

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Emile Bertrand
Formula:
Be4(Si2O7)(OH)2
Colour:
Colourless, pale yellow.
Lustre:
Vitreous
Hardness:
6 - 7
Specific Gravity:
2.59 - 2.6
Crystal System:
Orthorhombic
Name:
Named by Alexis Damour in honor of Émile Bertrand (1844 - 16 November 1909), French mineralogist and co-founder of the Société française de Minéralogie.
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Classification of BertranditeHide

Approved, 'Grandfathered' (first described prior to 1959)
9.BD.05

9 : SILICATES (Germanates)
B : Sorosilicates
D : Si2O7 groups, with additional anions; cations in tetrahedral [4] and greater coordination
56.1.1.1

56 : SOROSILICATES Si2O7 Groups, With Additional O, OH, F and H2O
1 : Si2O7 Groups and O, OH, F, and H2O with cations in [4] coordination
14.3.2

14 : Silicates not Containing Aluminum
3 : Silicates of Be

Physical Properties of BertranditeHide

Vitreous
Transparency:
Transparent
Comment:
Pearly on cleavage {001}
Colour:
Colourless, pale yellow.
Hardness:
6 - 7 on Mohs scale
Cleavage:
Perfect
Perfect on {001}
Distinct on {100}, {010} and {110}
Density:
2.59 - 2.6 g/cm3 (Measured)    2.61 g/cm3 (Calculated)

Optical Data of BertranditeHide

Type:
Biaxial (-)
RI values:
nα = 1.591 nβ = 1.605 nγ = 1.614
2V:
Measured: 73° to 81°, Calculated: 76°
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r < v weak

Chemical Properties of BertranditeHide

Formula:
Be4(Si2O7)(OH)2
IMA Formula:
Be4Si2O7(OH)2
Common Impurities:
Al,Fe,Ca

Crystallography of BertranditeHide

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Cmc21
Cell Parameters:
a = 8.7135(4) Å, b = 15.268(1) Å, c = 4.5683(3) Å
Ratio:
a:b:c = 0.571 : 1 : 0.299
Unit Cell V:
607.76 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Thin tabular, prismatic to needle-like
Twinning:
Common on {011}, {021}; heart- or V-shaped twins.

Crystallographic forms of BertranditeHide

Crystal Atlas:
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Bertrandite no.19 - Goldschmidt (1913-1926)
Bertrandite no.20 - Goldschmidt (1913-1926)
Bertrandite no.21 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Type Occurrence of BertranditeHide

Place of Conservation of Type Material:
National School of Mines, Paris, France

Synonyms of BertranditeHide

Other Language Names for BertranditeHide

Simplified Chinese:羟硅铍石
Spanish:Bertrandita
Traditional Chinese:羥矽鈹石

Varieties of BertranditeHide

Gel-BertranditeA glassy colloidal form of Bertrandite.
Originally described from Lovozero massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia.

Common AssociatesHide

Associated Minerals Based on Photo Data:
Quartz81 photos of Bertrandite associated with Quartz on mindat.org.
Fluorapatite64 photos of Bertrandite associated with Fluorapatite on mindat.org.
Albite47 photos of Bertrandite associated with Albite on mindat.org.
Muscovite40 photos of Bertrandite associated with Muscovite on mindat.org.
Fluorite36 photos of Bertrandite associated with Fluorite on mindat.org.
Smoky Quartz32 photos of Bertrandite associated with Smoky Quartz on mindat.org.
Pyrite17 photos of Bertrandite associated with Pyrite on mindat.org.
Rhodochrosite10 photos of Bertrandite associated with Rhodochrosite on mindat.org.
Beryl10 photos of Bertrandite associated with Beryl on mindat.org.
Aquamarine9 photos of Bertrandite associated with Aquamarine on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.BD.10HemimorphiteZn4Si2O7(OH)2 · H2OOrth. mm2 : Imm2
9.BD.15JunitoiteCaZn2Si2O7 · H2OOrth. mm2
9.BD.20Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
9.BD.20Axinite-(Mg)Ca2MgAl2BSi4O15OHTric.
9.BD.20Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
9.BD.20TinzeniteCa2Mn2+4Al4[B2Si8O30](OH)2Tric.
9.BD.25VistepiteSnMn4B2Si4O16(OH)2Tric. 1
9.BD.30BoralsiliteAl16B6Si2O37Mon. 2/m : B2/m
9.BD.35Werdingite(Mg,Fe)2Al14Si4B4O37Tric.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.3.1PhenakiteBe2SiO4Trig. 3 : R3
14.3.3BerylliteBe3(SiO4)(OH)2 · H2OOrth.
14.3.4LiberiteLi2BeSiO4Mon. m : Pm
14.3.5ChkaloviteNa2BeSi2O6Orth. mm2 : Fdd2
14.3.6EudidymiteNa2Be2Si6O15 · H2OMon. 2/m : B2/b
14.3.7EpididymiteNa2Be2Si6O15 · H2OOrth. mmm (2/m 2/m 2/m) : Pnma
14.3.8GugiaiteCa2Be(Si2O7)Tet.
14.3.9Jeffreyite(Ca,Na)2(Be,Al)(Si2O7,HSi2O7)Orth.
14.3.10Semenovite-(Ce)Na8Ca2FeBe6Ce2Si14O40(OH)4F4Orth. mmm (2/m 2/m 2/m)
14.3.11BaryliteBe2Ba(Si2O7)Orth.
14.3.12Hingganite-(Ce)(Ce,REE)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
14.3.13Hingganite-(Yb)(Yb,Y,REE)2□Be2[SiO4]2(OH)2
14.3.14Hingganite-(Y)(Y,REE,Ca)2(□,Fe2+)Be2[SiO4]2(OH)2Mon. 2/m : P21/b
14.3.15Minasgeraisite-(Y)CaBe2Y2Si2O10Mon. 2/m : P21/b
14.3.16SørenseniteNa4SnBe2Si6O16(OH)4Mon. 2/m : B2/b
14.3.17TrimeriteCaMn2+2Be3(SiO4)3Mon. 2/m : P21/m
14.3.18ChiavenniteCaMnBe2Si5O13(OH)2 · 2H2OMon. 2/m : P21/b
14.3.19Tvedalite(Ca,Mn)4Be3Si6O17(OH)4 · 3H2OOrth.
14.3.20HarstigiteCa6(Mn,Mg)Be4Si6(O,OH)24Orth.
14.3.21SverigeiteNaMnMgSnBe2(SiO4)3(OH)Orth. mmm (2/m 2/m 2/m) : Imma
14.3.22Joesmithite{Pb}{Ca2}{Mg3Fe3+2}(Be2Si6O22)(OH)2Mon.
14.3.23Gadolinite-(Y)Y2Fe2+Be2Si2O10Mon. 2/m : P21/b
14.3.24Gadolinite-(Ce)(Ce,La,Nd,Y)2Fe2+Be2Si2O10Mon. 2/m
14.3.25Calciogadolinite-(Y)(YCa)2Fe3+Be2[SiO4]2O2

Other InformationHide

Electrical:
Pyroelectric
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 BertranditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Damour, A.A. (1883) Note et analyse sur le nouveau miné des environs de Nantes. Bulletin de la Société Minéralogique de France: 6: 252-254.
Bowman, H.L. (1911) On the occurrence of bertrandite at the Cheesewring Quarry, near Liskeard, Cornwall. Mineralogical Magazine, Vol. 16, pg. 47-50.
Solov'eva, L.P., Belov, N.V. (1965) Precise determination of the crystal structure of bertrandite Be4[Si2O7](OH)2. Soviet Physics - Crystallography: 9: 458-460.
Henderson, W.A., Jr. (1975) The Bertrandites of Connecticut. The Mineralogical Record: 6(3): 114-123.
Hazen, R.M., Au, A.Y. (1986) High-pressure crystal chemistry of phenakite (Be2SiO4) and bertrandite (Be4Si2O7(OH)2). Physics and Chemistry of Minerals: 13: 69-78.
Hofmeister, A.M., Hoering, T.C., Virgo, D. (1987) Vibrational spectroscopy of beryllium aluminosilicates: heat capacity calculations from band assignments. Physics and Chemistry of Minerals: 14: 205-224.
Giuseppetti, G., Tadini, C., Mattioli, V. (1992) Bertrandite: Be4Si2O7(OH)2, from Val Vigezzo (NO) Italy: the X-ray structural refinement. Neues Jahrbuch für Mineralogie, Monatshefte: 1992: 13-19.

Internet Links for BertranditeHide

Localities for BertranditeHide

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Locality ListShow

Mineral and/or Locality  
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