Ellenbergerite Mineral Data

General Ellenbergerite Information

Chemical Formula:

Mg6TiAl6Si8O28(OH)10

Composition:

Molecular Weight = 1,198.34 gm

Magnesium 12.17 % Mg 20.18 % MgO

Titanium 4.00 % Ti 6.67 % TiO₂

Aluminum 13.51 % Al 25.53 % Al₂O₃

Silicon 18.75 % Si 40.11 % SiO₂

Hydrogen 0.84 % H 7.52 % H₂O

Oxygen 50.73 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₆TiAl₆Si₈O₂₈(OH)₁₀

Environment:

As inclusions in pyrope porphyroblasts developed during high-pressure (25-30 kbar), medium-temperature (700 ±C{800 ±C) metamorphism of continental crustal rocks.

IMA Status:

Approved IMA 1986

Locality:

Dora-Maira massif, Parigi, near Martiniana Po, Piedmont, Italy. Link to MinDat.org Location Data.

Name Origin:

Named for Francois Ellenberger, Paris, France, for his geological work in the western Alps.

Name Pronunciation:

Ellenbergerite + Pronunciation

Synonym:

ICSD 66681

PDF 40-507

Ellenbergerite Image

Images:

Ellenbergerite

Comments: Pale pink glassy nearly pure mass of ellenbergerite.
Location: Dora-Meira Massif, Parigi, Piemonte, Italy. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ellenbergerite Crystallography

Axial Ratios:

a:c = 1:0.40244

Cell Dimensions:

a = 12.255, c = 4.932, Z = 1; V = 641.48 Den(Calc)= 3.10

Crystal System:

Hexagonal - PyramidalH-M Symbol (6) Space Group: P 6₃

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

By Intensity(I/I_o): 3.54(0.75), 2.653(0.7), 3.06(0.55),

Crystal Structure:

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Comodi P , Zanazzi P F , European Journal of Mineralogy , 5 (1993) p.819-829, Structural study of ellenbergerite. Part 1: Effects of high temperature, Sample: I, T = 20 deg C

View Additional jPOWD Structure files for Ellenbergerite
[1] [2] [3] [4] [5]

Physical Properties of Ellenbergerite

Cleavage:

None

Color:

Colorless, Purple, Lilac.

Density:

3.15 - 3.22, Average = 3.18

Diaphaneity:

Transparent

Hardness:

6.5 - Pyrite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ellenbergerite

Gladstone-Dale:

CI meas= 0.087 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2143,KPDmeas= 0.2086,KC= 0.2284
Ncalc = 1.71 - 1.74

Optical Data:

Uniaxial (-), e=1.6538-1.6697, w=1.6553-1.6789, bire=0.0015-0.0092.

Calculated Properties of Ellenbergerite

Electron Density:

Bulk Density (Electron Density)=3.09 gm/cc
note: Specific Gravity of Ellenbergerite =3.10 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Ellenbergerite}= 2.04 barns/electron
U=PE_{Ellenbergerite} x rElectron Density= 6.32 barns/cc.

Radioactivity:

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

Ellenbergerite Classification

Dana Class:

52.04.10.01 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.04)with cations in [6] and/or > [6] coordination

(52.04.10)Dana Group

52.04.10.01 Ellenbergerite Mg6TiAl6Si8O28(OH)10 P 6₃ 6

Strunz Class:

09.AF.80 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AF -Nesosilicates with additional anions;

09.AF.80 Ellenbergerite Mg6TiAl6Si8O28(OH)10 P 6₃ 6

Other Ellenbergerite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Bull.Miner.,Vol.107-111,1984-1988) OPTIC PROP.(Bull.Miner.,Vol.107-111,1984-1988)

See Also:

Links to other databases for Ellenbergerite :
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 - Minerals in Thin Section-University of North Carolina
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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

Ellenbergerite

Mg6TiAl6Si8O28(OH)10
Dana No: 52.04.10.01 Strunz No: 09.AF.80
Locality:

Notes: