Werdingite Mineral Data (original) (raw)

General Werdingite Information

Help on Chemical Formula: Chemical Formula:

(Mg,Fe)2Al14B4Si4O37

Help on Composition: 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

Help on Empirical Formula: Empirical Formula:

Mg1.4Fe2+0.9Al14.2B3.6Si4O36.9

Help on Environment: Environment:

Granitic pegmatites cutting granulite-facies metapelitic rocks

Help on IMA Status: IMA Status:

Approved IMA 1990

Help on Locality: 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.

Help on Name Origin: Name Origin:

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

Help on Name Pronunciation: Name Pronunciation:

Werdingite + Pronunciation Say WERDINGITE

Help on Synonym: Synonym:

ICSD 69604

IMA1988-023

PDF 46-1359

Werdingite Image

Click Here for Larger Werdingite Image in a New Browser Window Images:

Click Here for Larger Werdingite Image 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

Help on Axial Ratios: Axial Ratios:

a:b:c =0.9807:1:1.3991

Help on Cell Dimensions: 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

Help on Crystal System: Crystal System:

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

Help on X Ray Diffraction: X Ray Diffraction:

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

Click Here for Large Werdingite Structure Window Crystal Structure:

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drag1 - LMB Manipulate Structure
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Help on Above

| | 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

Help on Cleavage: Cleavage:

{???} Indistinct

Help on Color: Color:

Brownish yellow.

Help on Density: Density:

3.04

Help on Diaphaneity: Diaphaneity:

Translucent

Help on Habit: Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Help on Hardness: Hardness:

7 - Quartz

Help on Luster: Luster:

Vitreous (Glassy)

Help on Streak: Streak:

white

Optical Properties of Werdingite

Help on Gladstone-Dale: 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

Help on Optical Data: 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.

Help on Pleochroism (x): Pleochroism (x):

colorless.

Help on Pleochroism (y): Pleochroism (y):

yellow.

Help on Pleochroism (z): Pleochroism (z):

colorless.

Calculated Properties of Werdingite

Help on Electron Density: Electron Density:

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

Help on Fermion Index: Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Help on Photoelectric: Photoelectric:

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

Help on Radioactivity: Radioactivity:

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

Werdingite Classification

Help on Dana Class: 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

Help on Strunz Class: 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

Help on References: References:

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

Help on See Also: 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 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Ask about Werdingite here :
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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: