Hennomartinite Mineral Data

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.

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 - DipyramidalH-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),

Crystal Structure:

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Libowitzky E , Armbruster T , American Mineralogist , 81 (1996) p.9-18, Lawsonite-type phase transitions in hennomartinite, SrMn2[Si2O7](OH)2.H2O, T = 22 C

View Additional jPOWD Structure files for Hennomartinite
[1]

Physical Properties of Hennomartinite

Cleavage:

None

Color:

Brown, Yellow brown.

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Hennomartinite

Electron Density:

r_electron=3.50 gm/cc
note: r_{Hennomartinite}=3.66 gm/cc.

Fermion Index

Fermion Index = 0.02114
Boson Index = 0.97886

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hennomartinite is Not Radioactive

Hennomartinite Classification

Dana Class:

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

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

(56.2.3)Lawsonite - Ilvaite group

56.2.3.1 Lawsonite CaAl2Si2O7(OH)2·(H2O) Ccmm 2/m 2/m 2/m

56.2.3.2 Hennomartinite SrMn2Si2O7(OH)2·(H2O) C mcm 2/m 2/m 2/m

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

56.2.3.4 Noelbensonite! BaMn2(Si2O7)(OH)2·(H2O) C mcm 2/m 2/m 2/m

56.2.3.5 Itoigawaite! SrAl2Si2O7(OH)2·(H2O) C mcm 2/m 2/m 2/m

56.2.3.6 IMA2002-016! CaFeFe(Mn,Fe)(Si2O7)O(OH) P 2₁/a 2/m

Strunz Class:

VIII/C.10-15 VIII - Silicates

VIII/C - Sorosilicates with [Si2O7]6-, with anions unfamiliar to tetraheders [O,OH,F]

VIII/C.10 - Lawsonite - Ilvaite series

VIII/C.10-10 Lawsonite CaAl2Si2O7(OH)2·(H2O) Ccmm 2/m 2/m 2/m

VIII/C.10-12 Itoigawaite! SrAl2Si2O7(OH)2·(H2O) C mcm 2/m 2/m 2/m

VIII/C.10-15 Hennomartinite SrMn2Si2O7(OH)2·(H2O) C mcm 2/m 2/m 2/m

VIII/C.10-17 Noelbensonite! BaMn2(Si2O7)(OH)2·(H2O) C mcm 2/m 2/m 2/m

VIII/C.10-20 Ilvaite CaFe2FeSi2O7O(OH) Pbnm 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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (MinSocAm) 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Hennomartinite

SrMn+++2Si2O7(OH)2·(H2O)
Dana No: 56.2.3.2 Strunz No: VIII/C.10-15
Locality:

Notes: