Neltnerite Mineral Data

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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:

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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

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Ask about Neltnerite here :
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Mindat.org's Discussion Groups
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Rockhounds Discussion Group on Yahoo Groups
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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: