Neltnerite Mineral Data

Neltnerite Mineral Data
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General Neltnerite Information

Help on Chemical Formula: Chemical Formula: CaMn+++6SiO12
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: CaMn3+6SiO12
Help on Environment: Environment: Vein with minerals containing manganese and calcium.
Help on IMA Status: IMA Status: Approved IMA 1982
Help on Locality: Locality: Tachgagalt, Anti-Atlas Mountains, Morocco. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Louis Neltner, pioneer student of mineral deposits of the High Atlas Mountains, Morocco.
Help on Name Pronunciation: Name Pronunciation: Neltnerite + Pronunciation Say NELTNERITE
Help on Synonym: Synonym: ICSD 28423
  PDF 35-66
 

Neltnerite Image

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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
Help on Axial Ratios: Axial Ratios: a:c = 1:1.99218
Help on Cell Dimensions: Cell Dimensions: a = 9.464, c = 18.854, Z = 8; V = 1,688.70 Den(Calc)= 4.64
Help on Crystal System: 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/Io): 2.728(1), 1.672(0.85), 1.427(0.6),
Click Here for Large Neltnerite Structure Window 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

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Black.
Help on Density: Density: 4.63
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: black
 

Optical Properties of Neltnerite

Help on Optical Data: 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

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.41 gm/cc
note: Specific Gravity of Neltnerite =4.64 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0024718426
Boson Index = 0.9975281574
Help on Photoelectric: Photoelectric: PENeltnerite = 15.62 barns/electron
U=PENeltnerite x rElectron Density= 68.81 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Neltnerite is Not Radioactive
 

Neltnerite Classification
Help on Dana Class: 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
Help on Strunz Class: 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
Help on References: References: NAME( AntBidBlaNic3) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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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Neltnerite

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

 

Notes: