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Hennomartinite Mineral Data

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General Hennomartinite Information

Help on Chemical  Formula: Chemical Formula: SrMn+++2Si2O7(OH)2•(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: SrMn3+2Si2O7(OH)2•(H2O)
Help on Environment: Environment: Overgrowing sugilite in serandite-pectolite rock. Isotructural with lawsonite.
Help on IMA Status: IMA Status: Approved IMA 1993
Help on Locality: Locality: Wessels mine, Kalahari manganese field, South Africa. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Henno Martin, German geologist who escaped to South Africa from Nazi Germany.
Help on Name Pronunciation: Name Pronunciation: Hennomartinite + Pronunciation Say HENNOMARTINITE
Help on Synonym: Synonym: ICSD 83667
  IMA1992-033
 

Hennomartinite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.6923:1:1.4829
Help on Cell Dimensions: Cell Dimensions: a = 6.255, b = 9.034, c = 13.397, Z = 4; V = 757.03 Den(Calc)= 3.66
Help on Crystal System: 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/Io): 2.833(1), 4.804(0.86), 2.807(0.82),
 

Physical Properties of Hennomartinite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Yellow brown.
Help on Diaphaneity: Diaphaneity: Translucent
Help on Hardness: Hardness: 4 - Fluorite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellowish brown
 

Optical Properties of Hennomartinite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.224,KC= 0.2389
Ncalc = 1.87
Help on Optical Data: Optical Data: Biaxial (+/-), a=1.82, 2V(Meas)=63.
 

Calculated Properties of Hennomartinite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.50 gm/cc
note: Specific Gravity of Hennomartinite =3.66 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEHennomartinite = 30.50 barns/electron
U=PEHennomartinite x rElectron Density= 106.90 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hennomartinite is Not Radioactive
 

Hennomartinite Classification

Help on  Dana Class: 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
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.79,p763,1994) OPTIC PROP.(Am.Min.,Vol.79,p763,1994)
Help on See Also: 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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Print or Cut-and-Paste your Hennomartinite Specimen Label here :

Hennomartinite

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

 

Notes:

 

 
   
 


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