Noelbensonite Mineral Data

[Minerals] [Gems] [Sale Items] [Gold Rings] [Big Stuff] [Main Page]
Shop early for Holiday Season and get the best stuff.
You can put it on layaway for up to six weeks!

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 noélbensonite.
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 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Noelbensonite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Noelbensonite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Noelbensonite Mineral Data :

Ask about Noelbensonite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: