Neltnerite Mineral Data

Advertisment

John Betts - Fine Minerals, New York. Dealers of Fine Minerals and Natural Crystal Clusters since 1989. We buy rock collections, we buy gem collections, we buy mineral collections.

Weinrich Minerals, A Dealer in Fine Mineral Specimens - Since 1989. We buy collections and single high quality specimens.

Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

General Neltnerite Information

Chemical Formula:

CaMn+++6SiO12

Composition:

Molecular Weight = 589.78 gm

Calcium 6.80 % Ca 9.51 % CaO

Manganese 55.89 % Mn 80.30 % Mn₂O₃

Silicon 4.76 % Si 10.19 % SiO₂

Oxygen 32.55 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMn³⁺₆SiO₁₂

Environment:

Vein with minerals containing manganese and calcium.

IMA Status:

Approved IMA 1982

Locality:

Tachgagalt, Anti-Atlas Mountains, Morocco. Link to MinDat.org Location Data.

Name Origin:

Named for Louis Neltner, pioneer student of mineral deposits of the High Atlas Mountains, Morocco.

Name Pronunciation:

Neltnerite + Pronunciation

Synonym:

ICSD 28423

PDF 35-66

Neltnerite Image

Images:

Neltnerite

Comments: Black neltnerite microcrystals lining vugs.
Location: Manganese Creek, Keeweenaw County, Michigan, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Neltnerite Crystallography

Axial Ratios:

a:c = 1:1.99218

Cell Dimensions:

a = 9.464, c = 18.854, Z = 8; V = 1,688.70 Den(Calc)= 4.64

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/acd

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

By Intensity(I/I_o): 2.728(1), 1.672(0.85), 1.427(0.6),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

de Villiers J P R , Dobson S M , Buseck P R , European Journal of Mineralogy , 3 (1991) p.567-573, Refinement of the crystal structure of neltnerite,, a member of the bixbyite-braunite group of minerals

Physical Properties of Neltnerite

Cleavage:

{???} Indistinct

Color:

Black.

Density:

4.63

Diaphaneity:

Opaque

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Hardness:

6 - Orthoclase

Luster:

Sub Metallic

Streak:

black

Optical Properties of Neltnerite

Optical Data:

NCalc= 2.31 - from Gladstone-Dale relationship (KC = 0.2829) where Ncalc=Dcalc*KC+1
NCalc= 2.31 - from Gladstone-Dale relationship (KC = 0.2829) where Ncalc=Dmeas*KC+1

Calculated Properties of Neltnerite

Electron Density:

Bulk Density (Electron Density)=4.41 gm/cc
note: Specific Gravity of Neltnerite =4.64 gm/cc.

Fermion Index:

Fermion Index = 0.0024718426
Boson Index = 0.9975281574

Photoelectric:

PE_Neltnerite= 15.62 barns/electron
U=PE_Neltnerite x rElectron Density= 68.81 barns/cc.

Radioactivity:

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

Neltnerite Classification

Dana Class:

07.05.01.02 (07)Multiple Oxides

(07.05)where A B X2

(07.05.01)Humite group (Tetragonal: I41/acd) containing Si

07.05.01.01 Braunite-I MnMn6SiO12 I 4₁/acd 4/m 2/m 2/m

07.05.01.02 Neltnerite CaMn6SiO12 I 4₁/acd 4/m 2/m 2/m

07.05.01.03 Braunite-II* MnMn6SiO12 I 4₁/acd 4/m 2/m 2/m

07.05.01.04 Abswurmbachite CuMn6SiO12 I 4₁/acd 4/m 2/m 2/m

Strunz Class:

09.AG.05 09 - SILICATES (Germanates)

09.A - Nesosilicates

09.AG -Nesosilicates with additional anions; cations in > [6] ± [6] coordination

09.AG.05 Abswurmbachite CuMn6SiO12 I 4₁/acd 4/m 2/m 2/m

09.AG.05 Braunite-I MnMn6SiO12 I 4₁/acd 4/m 2/m 2/m

09.AG.05 Braunite-II* MnMn6SiO12 I 4₁/acd 4/m 2/m 2/m

09.AG.05 Neltnerite CaMn6SiO12 I 4₁/acd 4/m 2/m 2/m

Other Neltnerite Information

References:

NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Neltnerite :
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

Search for Neltnerite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Neltnerite :

Cape Minerals Google Search for Neltnerite
Dakota Matrix Minerals Google Search for Neltnerite
Excalibur Mineral Corp. Google Search for Neltnerite
John Betts Fine Minerals Search for Neltnerite
McDougall Minerals Google Search for Neltnerite
Mineral News Website Link
Rock and Mineral Shows Google Search for Neltnerite
Weinrich Minerals, Inc. Google Search for Neltnerite

Ask about Neltnerite 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 Neltnerite Specimen Label here :

Neltnerite

CaMn+++6SiO12
Dana No: 07.05.01.02 Strunz No: 09.AG.05
Locality:

Notes: