Werdingite Mineral Data

Werdingite Mineral Data +

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General Werdingite Information

Chemical Formula:

(Mg,Fe)2Al14B4Si4O37

Composition:

Molecular Weight = 1,209.06 gm

Magnesium 2.81 % Mg 4.67 % MgO

Aluminum 31.69 % Al 59.87 % Al₂O₃

Iron 4.16 % Fe 5.35 % FeO

Silicon 9.29 % Si 19.88 % SiO₂

Boron 3.22 % B 10.36 % B₂O₃

Oxygen 48.83 % O

______ ______

100.00 % 100.13 % = TOTAL OXIDE

Empirical Formula:

Mg_1.4Fe²⁺_0.9Al_14.2B_3.6Si₄O_36.9

Environment:

Granitic pegmatites cutting granulite-facies metapelitic rocks

IMA Status:

Approved IMA 1990

Locality:

Cap Andrahomana, near Fort Dauphin, southeastern Madagascar (type locality of grandidierite), and at Almgjotheii, in the aureole of the Rogaland anorthosite complex, southwestern Norwa Link to MinDat.org Location Data.

Name Origin:

Named for Gunter Werding, of the Mineralogical Institute, Ruhr University, Bochum, Germany.

Synonym:

ICSD 69604

IMA1988-023

PDF 46-1359

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Werdingite Crystallography

Axial Ratios:

a:b:c =0.9807:1:1.3991

Cell Dimensions:

a = 7.995, b = 8.152, c = 11.406, Z = 1; alpha = 110.45°, beta = 110.85°, gamma = 84.66° V = 648.10 Den(Calc)= 3.10

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 5.23(1), 5.43(0.8), 4.98(0.75),

Crystal Structure:

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Niven M L , Waters D J , Moore J M , American Mineralogist , 76 (1991) p.246-256, The crystal structure of werdingite, (Mg,Fe)2Al12(Al,Fe)2Si4(B,Al)4O37, and, its relationship to sillimanite, mullite and grandidierite

Physical Properties of Werdingite

Cleavage:

[???] Indistinct

Color:

Brownish yellow.

Density:

3.04

Diaphaniety:

Translucent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

7 - Quartz

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Werdingite

Gladstone-Dale:

CI meas= -0.012 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.007 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2055,KPDmeas= 0.2095,KC= 0.207

Optical Data:

Biaxial (-), a=1.614, b=1.646, g=1.651, bire=0.0370, 2V(Calc)=42, 2V(Meas)=33-42. Dispersion r > v moderately strong.

Pleochroism (x):

colorless.

Pleochroism (y):

yellow.

Pleochroism (z):

colorless.

Calculated Properties of Werdingite

Electron Density:

r_electron=3.05 gm/cc
note: r_Werdingite=3.10 gm/cc.

Fermion Index

Fermion Index = 0.01467
Boson Index = 0.98533

Photoelectric:

PE_Werdingite= 2.61 barns/electron
U=PE_Werdingite x r_electron= 7.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Werdingite is Not Radioactive

Werdingite Classification

Dana Class:

56.3.2.1 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.3)with [Si2O7] with borate groups

(56.3.2)Dana Group

56.3.2.1 Werdingite (Mg,Fe)2Al14B4Si4O37 P1 1

Strunz Class:

VIII/B.31-50 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, with beryllium and boron

VIII/B.31 - Kornerupine - Harkerite series

VIII/B.31-10 Kornerupine (Mg,Fe)4(Al,Fe)6(SiO4,BO4)5(O,OH)2 C mcm 2/m 2/m 2/m

VIII/B.31-12 Prismatine! ([],Fe,Mg)(Mg,Al,Fe)5Al4Si2(Si,Al)2(B,Si,Al)(O,OH,F)22 C mcm 2/m 2/m 2/m

VIII/B.31-15 Magnesiodumortierite (Mg,Ti,[])<1(Al,Mg)2Al4Si3O18-y(OH)yBy=2-3 Pmcn 2/m 2/m 2/m

VIII/B.31-20 Dumortierite Al6.5-7(BO3)(SiO4)3(O,OH)3 Pcmn 2/m 2/m 2/m

VIII/B.31-30 Holtite Al6(Al,Ta)(BO3)[(SiO4,SbO4,AsO4)]3(O,OH)3 P nma 2/m 2/m 2/m

VIII/B.31-40 Grandidierite (Mg,Fe)Al3(BO4)(SiO4)O Pbnm 2/m 2/m 2/m

VIII/B.31-42 Ominelite! (Fe,Mg)Al3BSiO9 Pbnm 2/m 2/m 2/m

VIII/B.31-45 Boralsilite! Al16B6Si2O27 C 2/m 2/m

VIII/B.31-50 Werdingite (Mg,Fe)2Al14B4Si4O37 P1 1

VIII/B.31-60 Harkerite Ca24Mg8Al2(SiO4)8(BO3)6(CO3)10·2(H2O) R 3m 3 2/m

Other Werdingite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.75,p415-420,1990) OPTIC PROP.(AntBidBlaNic2)

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Werdingite

(Mg,Fe)2Al14B4Si4O37
Dana No: 56.3.2.1 Strunz No: VIII/B.31-50
Locality:

Notes: