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.

Name Pronunciation:

Werdingite + Pronunciation

Synonym:

ICSD 69604

IMA1988-023

PDF 46-1359

Werdingite Image

Images:

Werdingite

Comments: B&W PPL image of grandidierite-hercynite symplectite replacing werdingite (W), whereas adjacent kornerupine (K) appears unafected. (AmMin, v75:415).
Location: Granulite facies of the Namaqualand metamorphic complex at Bok se Puts, Namaqualand, South Africa. Scale: Picture Size 3 mm.
© American Mineralogist

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

Diaphaneity:

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= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2061,KPDmeas= 0.2095,KC= 0.207
Ncalc = 1.63 - 1.64

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:

Bulk Density (Electron Density)=3.04 gm/cc
note: Specific Gravity of Werdingite =3.09 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Werdingite= 2.61 barns/electron
U=PE_Werdingite x rElectron Density= 7.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Werdingite is Not Radioactive

Werdingite Classification

Dana Class:

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

(56.03)with [Si2O7] with borate groups

(56.03.02)Dana Group

56.03.02.01 Werdingite (Mg,Fe)2Al14B4Si4O37 P1 1

Strunz Class:

09.BD.35 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BD -Si2O7 groups with additional anions;

09.BD.35 Werdingite (Mg,Fe)2Al14B4Si4O37 P1 1

Other Werdingite Information

References:

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

See Also:

Links to other databases for Werdingite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Werdingite Specimen Label here :

Werdingite

(Mg,Fe)2Al14B4Si4O37
Dana No: 56.03.02.01 Strunz No: 09.BD.35
Locality:

Notes: