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Neltnerite Mineral Data
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General Neltnerite Information
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 Chemical Formula: |
CaMn+++6SiO12 |
| Composition: |
Molecular Weight = 589.78 gm |
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Calcium 6.80 % Ca 9.51 % CaO |
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Manganese 55.89 % Mn 80.30 % Mn2O3 |
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Silicon 4.76 % Si 10.19 % SiO2 |
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Oxygen 32.55 % O |
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______ ______ |
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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 |
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PDF 35-66 |
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Neltnerite Image |
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Images:
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Neltnerite Crystallography
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| 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 Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/acd |
| X Ray Diffraction: |
By Intensity(I/Io): 2.728(1), 1.672(0.85), 1.427(0.6), |
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Physical Properties of Neltnerite
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| 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 |
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Optical Properties of Neltnerite
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| 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
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Calculated Properties of Neltnerite
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| Electron Density: |
Bulk Density (Electron Density)=4.41 gm/cc
note: Specific Gravity of Neltnerite =4.64 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0024718426
Boson Index = 0.9975281574 |
| Photoelectric: |
PENeltnerite = 15.62 barns/electron
U=PENeltnerite x rElectron Density= 68.81 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Neltnerite is Not Radioactive |
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Neltnerite Classification
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| Dana Class: |
07.05.01.02 (07)Multiple Oxides |
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(07.05)where A B X2 |
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(07.05.01)Humite group (Tetragonal: I41/acd) containing Si |
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07.05.01.01 Braunite-I MnMn6SiO12 I 41/acd 4/m 2/m 2/m |
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07.05.01.02 Neltnerite CaMn6SiO12 I 41/acd 4/m 2/m 2/m |
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07.05.01.03 Braunite-II* MnMn6SiO12 I 41/acd 4/m 2/m 2/m |
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07.05.01.04 Abswurmbachite CuMn6SiO12 I 41/acd 4/m 2/m 2/m |
| Strunz Class: |
09.AG.05 09 - SILICATES (Germanates) |
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09.A - Nesosilicates |
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09.AG -Nesosilicates with additional anions; cations in > [6] � [6] coordination |
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09.AG.05 Abswurmbachite CuMn6SiO12 I 41/acd 4/m 2/m 2/m |
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09.AG.05 Braunite-I MnMn6SiO12 I 41/acd 4/m 2/m 2/m |
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09.AG.05 Braunite-II* MnMn6SiO12 I 41/acd 4/m 2/m 2/m |
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09.AG.05 Neltnerite CaMn6SiO12 I 41/acd 4/m 2/m 2/m |
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Other Neltnerite Information
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| 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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Print or Cut-and-Paste your Neltnerite Specimen Label here :
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Neltnerite
CaMn+++6SiO12
Dana No: 07.05.01.02 Strunz No: 09.AG.05
Locality:
Notes:
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