Noelbensonite Mineral Data

General Noelbensonite Information

Chemical Formula:

BaMn+++2(Si2O7)(OH)2•(H2O)

Composition:

Molecular Weight = 467.40 gm

Barium 29.38 % Ba 32.80 % BaO

Manganese 23.51 % Mn 33.78 % Mn₂O₃

Silicon 12.02 % Si 25.71 % SiO₂

Hydrogen 0.86 % H 7.71 % H₂O

Oxygen 34.23 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaMn³⁺₂(Si₂O₇)(OH)₂•(H₂O)

Environment:

As a replacement of NaMn amphibole nemansilite and serandite and as the main or sole constituent of tiny veinlets.

IMA Status:

Approved IMA 1996 (Dana # Added)

Locality:

The Woods mine 30 km NNE of Tamworth, New South Wales, Australia. Link to MinDat.org Location Data.

Name Origin:

For William Noel Benson (1855-1957), of the University of Otago, in recognition of his pioneering research in the Great Serpentine Belt and New England Fold Belt of New South Wales, Australia.

Name Pronunciation:

Noelbensonite + Pronunciation

Synonym:

IMA1994-058

Noelbensonite Image

Images:

Noelbensonite

Comments: Brownish, massive noÃ©lbensonite.
Location: Woods Mine (Wood's Rhodonite Mine), Tamworth, New South Wales, Australia. Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag

Noelbensonite Crystallography

Axial Ratios:

a:b:c =0.6935:1:1.4932

Cell Dimensions:

a = 6.325, b = 9.12, c = 13.618, Z = 4; V = 785.54 Den(Calc)= 3.95

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): 4.84(1), 2.729(0.82), 2.869(0.8),

Physical Properties of Noelbensonite

Cleavage:

None

Color:

Dark brown.

Density:

3.87

Diaphaneity:

Translucent to transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Blocky - Crystal shape tends to be equant (e.g. feldspars).

Habit:

Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

4 - Fluorite

Luster:

Vitreous - Greasy

Streak:

yellow brown

Optical Properties of Noelbensonite

Gladstone-Dale:

CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2122,KPDmeas= 0.2166,KC= 0.2233
Ncalc = 1.86 - 1.88

Optical Data:

Biaxial (-), a=1.82, b=1.845, g=1.85, bire=0.0300, 2V(Calc)=46, 2V(Meas)=46. Dispersion distinct to strong, r > v.

Calculated Properties of Noelbensonite

Electron Density:

Bulk Density (Electron Density)=3.61 gm/cc
note: Specific Gravity of Noelbensonite =3.87 gm/cc.

Fermion Index:

Fermion Index = 0.05
Boson Index = 0.95

Photoelectric:

PE_{Noelbensonite}= 133.00 barns/electron
U=PE_{Noelbensonite} x rElectron Density= 480.13 barns/cc.

Radioactivity:

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

Noelbensonite Classification

Dana Class:

56.02.03.04 (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 Noelbensonite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,p1514,1996) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Noelbensonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Noelbensonite

BaMn+++2(Si2O7)(OH)2•(H2O)
Dana No: 56.02.03.04 Strunz No: 09.BE.05
Locality:

Notes: