Henritermierite Mineral Data

General Henritermierite Information

Chemical Formula:

Ca3(Mn,Al)2(SiO4)2(OH)4

Composition:

Molecular Weight = 468.33 gm

Calcium 25.67 % Ca 35.92 % CaO

Manganese 17.60 % Mn 25.28 % Mn₂O₃

Aluminum 2.88 % Al 5.44 % Al₂O₃

Silicon 11.99 % Si 25.66 % SiO₂

Hydrogen 0.86 % H 7.69 % H₂O

Oxygen 41.00 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₃Mn³⁺_1.5Al_0.5(SiO₄)₂(OH)₄

Environment:

As small grains filling interstices between crystals of other minerals in a manganese ore deposit.

IMA Status:

Approved IMA 1969

Locality:

Tachgagalt manganese mine, Anti-Atlas Mountains, Morocco. Link to MinDat.org Location Data.

Name Origin:

Named for Henri F.E. Termier (1897- ), Professor of Geology at the Sorbonne, Paris, France.

Name Pronunciation:

Henritermierite + Pronunciation

Synonym:

ICSD 51249

PDF 22-150

Henritermierite Image

Images:

Henritermierite

Comments: Dark brown octahedral henritermierite crystal on massive material.
Location: Wessels Mine, Kalahari Manganese Fields, Northern Cape Province, South Africa. Scale: Specimen Size 4.5 x 4 x 3 cm.
© Rob Lavinsky

Henritermierite Crystallography

Axial Ratios:

a:c = 1:0.96125

Cell Dimensions:

a = 12.39, c = 11.91, Z = 8; V = 1,828.33 Den(Calc)= 3.40

Crystal System:

Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/acd

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

By Intensity(I/I_o): 2.75(1), 2.516(0.8), 4.37(0.6),

Forms:

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Forms: ( 1 0 2) ( 1 1 0) ( 1 0 0)

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Physical Properties of Henritermierite

Cleavage:

None

Color:

Clove brown, Orange brown.

Density:

3.34

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Luster:

Vitreous (Glassy)

Optical Properties of Henritermierite

Gladstone-Dale:

CI meas= 0.033 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2301,KPDmeas= 0.2343,KC= 0.2423
Ncalc = 1.81 - 1.82

Optical Data:

Uniaxial (+), w=1.765, e=1.8, bire=0.0350.

Calculated Properties of Henritermierite

Electron Density:

Bulk Density (Electron Density)=3.31 gm/cc
note: Specific Gravity of Henritermierite =3.34 gm/cc.

Fermion Index:

Fermion Index = 0.0061458349
Boson Index = 0.9938541651

Photoelectric:

PE_{Henritermierite}= 8.14 barns/electron
U=PE_{Henritermierite} x rElectron Density= 26.92 barns/cc.

Radioactivity:

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

Henritermierite Classification

Dana Class:

51.04.04.01 (51)Nesosilicate Insular SiO4 Groups Only

(51.04)with cations in [6] and >[6] coordination

(51.04.04)Garnet group (Tetragonal Hydrogarnet)

51.04.04.01 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

51.04.04.02 Holtstamite! Ca3(Al,Mn)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Strunz Class:

09.AD.25 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AD -Nesosilicates without additional anions;

09.AD.25 Almandine Fe3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Calderite (Mn,Ca)3(Fe,Al)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Andradite Ca3Fe2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Goldmanite Ca3(V,Al,Fe)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Hibschite Ca3Al2(SiO4)3-x(OH)4x(x=0.2-1.5) I a3d 4/m 3 2/m

09.AD.25 Knorringite Mg3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Grossular Ca3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Henritermierite Ca3(Mn,Al)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

09.AD.25 Katoite Ca3Al2(SiO4)3-x(OH)4xx=1.5-3 I a3d 4/m 3 2/m

09.AD.25 Majorite Mg3(Fe,Al,Si)2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Kimzeyite Ca3(Zr,Ti)2(Si,Al,Fe)3O12 I a3d 4/m 3 2/m

09.AD.25 Morimotoite Ca3TiFeSi3O12 I a3d 4/m 3 2/m

09.AD.25 Pyrope Mg3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Spessartine Mn3Al2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Schorlomite Ca3(Ti,Fe,Al)2[(Si,Fe,Fe)O4]3 I a3d 4/m 3 2/m

09.AD.25 Uvarovite Ca3Cr2(SiO4)3 I a3d 4/m 3 2/m

09.AD.25 Wadalite Ca6Al5Si2O16Cl3 I 43d 4 3m

09.AD.25 Holtstamite! Ca3(Al,Mn)2(SiO4)2(OH)4 I 4₁/acd 4/m 2/m 2/m

Other Henritermierite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Henritermierite :
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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Henritermierite

Ca3(Mn,Al)2(SiO4)2(OH)4
Dana No: 51.04.04.01 Strunz No: 09.AD.25
Locality:

Notes:

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