Hennomartinite Mineral Data

General Hennomartinite Information

Chemical Formula:

SrMn+++2Si2O7(OH)2•(H2O)

Composition:

Molecular Weight = 417.69 gm

Strontium 20.98 % Sr 24.81 % SrO

Manganese 26.31 % Mn 37.80 % Mn₂O₃

Silicon 13.45 % Si 28.77 % SiO₂

Hydrogen 0.97 % H 8.63 % H₂O

Oxygen 38.30 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

SrMn³⁺₂Si₂O₇(OH)₂•(H₂O)

Environment:

Overgrowing sugilite in serandite-pectolite rock. Isotructural with lawsonite.

IMA Status:

Approved IMA 1993

Locality:

Wessels mine, Kalahari manganese field, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for Henno Martin, German geologist who escaped to South Africa from Nazi Germany.

Name Pronunciation:

Hennomartinite + Pronunciation

Synonym:

ICSD 83667

IMA1992-033

Hennomartinite Image

Images:

Hennomartinite

Comments: Reddish brown hennomartinite included in purple sugilite.
Location: Wessels Mine, Kalahari Manganese Field, Northern Cape Province, South Africa. Scale: 0.5 mm.
© John Veevaert

Hennomartinite Crystallography

Axial Ratios:

a:b:c =0.6923:1:1.4829

Cell Dimensions:

a = 6.255, b = 9.034, c = 13.397, Z = 4; V = 757.03 Den(Calc)= 3.66

Crystal System:

Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C mcm

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

By Intensity(I/I_o): 2.833(1), 4.804(0.86), 2.807(0.82),

Physical Properties of Hennomartinite

Cleavage:

None

Color:

Brown, Yellow brown.

Diaphaneity:

Translucent

Hardness:

4 - Fluorite

Luster:

Vitreous (Glassy)

Streak:

yellowish brown

Optical Properties of Hennomartinite

Gladstone-Dale:

CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.224,KC= 0.2389
Ncalc = 1.87

Optical Data:

Biaxial (+/-), a=1.82, 2V(Meas)=63.

Calculated Properties of Hennomartinite

Electron Density:

Bulk Density (Electron Density)=3.50 gm/cc
note: Specific Gravity of Hennomartinite =3.66 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Hennomartinite}= 30.50 barns/electron
U=PE_{Hennomartinite} x rElectron Density= 106.90 barns/cc.

Radioactivity:

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

Hennomartinite Classification

Dana Class:

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

(56.02)with cations in [4] and/or >[4] coordination

(56.02.03)Lawsonite - Ilvaite group

56.02.03.01 Lawsonite CaAl2Si2O7(OH)2•(H2O) Ccmm 2/m 2/m 2/m

56.02.03.02 Hennomartinite SrMn2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m

56.02.03.03 Ilvaite CaFe2FeSi2O7O(OH) Pbnm 2/m 2/m 2/m

56.02.03.04 Noelbensonite! BaMn2(Si2O7)(OH)2•(H2O) C mcm 2/m 2/m 2/m

56.02.03.05 Itoigawaite! SrAl2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m

56.02.03.06 Manganilvaite! CaFeFe(Mn,Fe)(Si2O7)O(OH) P 2₁/a 2/m

Strunz Class:

09.BE.05 09 - SILICATES (Germanates)

09.B - Sorosilicates

09.BE -Si2O7 groups with additional anions;

09.BE.05 Hennomartinite SrMn2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m

09.BE.05 Lawsonite CaAl2Si2O7(OH)2•(H2O) Ccmm 2/m 2/m 2/m

09.BE.05 Noelbensonite! BaMn2(Si2O7)(OH)2•(H2O) C mcm 2/m 2/m 2/m

09.BE.05 Itoigawaite! SrAl2Si2O7(OH)2•(H2O) C mcm 2/m 2/m 2/m

Other Hennomartinite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.79,p763,1994) OPTIC PROP.(Am.Min.,Vol.79,p763,1994)

See Also:

Links to other databases for Hennomartinite :
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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Hennomartinite

SrMn+++2Si2O7(OH)2•(H2O)
Dana No: 56.02.03.02 Strunz No: 09.BE.05
Locality:

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