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Neltnerite

A valid IMA mineral species
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01368390017271925408495.jpg
Neltnerite after Baudracco-Gritti et al. (1982)
00412220017271925437778.jpg
Neltnerite, etc.

Manganese Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA
04012140017271925465195.jpg
Neltnerite

Manganese Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA
01368390017271925408495.jpg
Neltnerite after Baudracco-Gritti et al. (1982)
00412220017271925437778.jpg
Neltnerite, etc.

Manganese Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA
04012140017271925465195.jpg
Neltnerite

Manganese Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA
05391050017271925501566.jpg
Neltnerite after Baudracco-Gritti et al. (1982)
00412220017271925437778.jpg
Neltnerite, etc.

Manganese Mine, Copper Harbor, Grant Township, Keweenaw County, Michigan, USA
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About NeltneriteHide

05306640017271925534254.jpg
Louis Neltner (1903-1985)
Formula:
CaMn3+6(SiO4)O8
Colour:
Black
Lustre:
Adamantine, Sub-Adamantine
Hardness:
6
Specific Gravity:
4.63
Crystal System:
Tetragonal
Member of:
Braunite Group
Name:
Named in honor of Louis Neltner [9 July 1903, Toulouse, France - 23 January 1985, Lyon, France], Director of the Ecole nationale supérieure des mines de Saint-Étienne, pioneer student of mineral deposits of the High Atlas Mountains, Morocco.
Isostructural with:
Braunite
Black pyramidal crystals, also complex elongated crystals.


Unique IdentifiersHide

Mindat ID:
2875
Long-form identifier:
mindat:1:1:2875:8

IMA Classification of NeltneriteHide

Classification of NeltneriteHide

Strunz-mindat (2026):
9.AG.05

9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
Dana 8th ed.:
7.5.1.2

7 : MULTIPLE OXIDES
5 : (AB)2X3
Hey's CIM Ref.:
14.18.19

14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
NelIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of NeltneriteHide

Lustre:
Adamantine, Sub-Adamantine
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
6 on Mohs scale
Hardness:
VHN100=1200 - 1220 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Fracture:
Sub-Conchoidal
Density:
4.63 g/cm3 (Measured)    4.65 g/cm3 (Calculated)

Optical Data of NeltneriteHide

Anisotropism:
Weak
Reflectivity:
WavelengthR1 (%)R2 (%)
470nm21.3%22.3%
546nm19.2%20.2%
589nm18.5%19.5%
650nm17.65%18.65%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 22.3%.
R1 shown in black, R2 shown in red
Colour in reflected light:
Gray to brownish gray

Chemistry of NeltneriteHide

Mindat Formula:
CaMn3+6(SiO4)O8
Element Weights:
Element% weight
Mn55.890 %
O32.553 %
Ca6.795 %
Si4.762 %

Calculated from ideal end-member formula.
Elements listed:
Ca, Mn, O, Si - search for minerals with similar chemistry
Common Impurities:
Fe

Crystallography of NeltneriteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal
Space Group:
I41/acd
Setting:
I41/acd
Cell Parameters:
a = 9.464 Å, c = 18.854(1) Å
Ratio:
a:c = 1 : 1.992
Unit Cell V:
1,688.70 ų (Calculated from Unit Cell)
Z:
8

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0006420Neltneritede Villiers J P R, Dobson S M, Buseck P R (1991) Refinement of the crystal structure of neltnerite, a member of the bixbyite-braunite group of minerals European Journal of Mineralogy 3 567-57319910293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.73 Å(20)
3.506 Å(20)
3.382 Å(10)
3.341 Å(10)
2.852 Å(10)
2.728 Å(100)
2.604 Å(10)
2.516 Å(10)
2.423 Å(10)
2.364 Å(30)
2.170 Å(30)
2.157 Å(30)
1.930 Å(10)
1.886 Å(10)
1.822 Å(10)
1.750 Å(10)
1.672 Å(85)
1.547 Å(20)
1.512 Å(15)
1.476 Å(15)
1.427 Å(60)
1.379 Å(10)
1.365 Å(25)
1.324 Å(10)
1.275 Å(10)
1.231 Å(10)
1.184 Å(15)
1.182 Å(15)
1.174 Å(10)
1.156 Å(10)
1.107 Å(10)
1.085 Å(50)
1.079 Å(10)
1.0595 Å(45)
1.056 Å(4.5)
2.364 Å(3)
Comments:
ICDD-366.

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 7: Great Oxidation Event<2.4
47e : [Vanadates, chromates, manganates]
47h : [Near-surface oxidized, dehydrated minerals]

Type Occurrence of NeltneriteHide

Synonyms of NeltneriteHide

Other Language Names for NeltneriteHide

Relationship of Neltnerite to other SpeciesHide

Member of:
Braunite Group
Other Members of Braunite Group:
AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm(4/m2/m2/m) : I41/acd
BrauniteMn2+Mn3+6(SiO4)O8Tet. 4/mmm(4/m2/m2/m) : I41/acd
'Braunite-II'Ca(Mn3+,Fe)14(SiO4)O20Tet. 4/mmm(4/m2/m2/m) : I41/acd
GatedaliteZrMn2+2Mn3+4SiO12Tet. 4/mmm(4/m2/m2/m) : I41/acd
SkogbyiteZr(Mg2Mn3+4)SiO12Tet. 4/mmm(4/m2/m2/m) : I41/acd

Common AssociatesHide

Associations Based on Photo Data:
3 photos of Neltnerite associated with OrientiteCa8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O
2 photos of Neltnerite associated with MacfalliteCa2Mn3+3(SiO4)(Si2O7)(OH)3
2 photos of Neltnerite associated with CalciteCaCO3
1 photo of Neltnerite associated with TangeiteCaCu(VO4)(OH)
1 photo of Neltnerite associated with PyrolusiteMn4+O2

Related Minerals - Strunz-mindat GroupingHide

9.AG.Aluminotaipingite-(CeCa)(Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4F3Trig. 3m : R3c
9.AG.'Ivanyukite-Na-T'Na2Ti4(SiO4)3(OH)O3 · 7H2OTrig. 3m : R3m
9.AG.'Ivanyukite-Na-C'Na2Ti4(SiO4)3(OH)2O2 · 6H2OIso. 43m : P43m
9.AG.EdgrewiteCa9(SiO4)4F2 Mon. 2/m : P21/b
9.AG.02GatedaliteZrMn2+2Mn3+4SiO12Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AG.05AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AG.05SkogbyiteZr(Mg2Mn3+4)SiO12Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AG.05BrauniteMn2+Mn3+6(SiO4)O8Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AG.05'Braunite-II'Ca(Mn3+,Fe)14(SiO4)O20Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AG.10LångbaniteMn2+4Mn3+9Sb5+O16(SiO4)2Trig. 3m : P3m1
9.AG.12Taipingite-(CeCa)(Ce7Ca2)◻Mg(SiO4)3[SiO3(OH)]4F3Trig. 3m : R3c
9.AG.15ŻabińskiiteCa[Al0.5(Ta,Nb)0.5)]O(SiO4)Tric. 1
9.AG.15TitaniteCaTiO(SiO4)Mon. 2/m : P21/b
9.AG.15VanadomalayaiteCaVO(SiO4)Mon. 2/m : B2/b
9.AG.15Natrotitanite(Na0.5Y0.5)TiO(SiO4)Mon. 2/m : B2/b
9.AG.15MalayaiteCaSnO(SiO4)Mon. 2/m
9.AG.20Ferricerite-(LaCa)(La6Ca3)◻Fe3+(SiO4)3(SiO3OH)4(OH)3Trig. 3m : R3c
9.AG.20Aluminocerite-(CeCa)(Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4(OH)3Trig. 3m : R3c
9.AG.20Cerite-(CeCa)(Ce7Ca2)◻Mg(SiO4)3(SiO3OH)4(OH)3Trig. 3m : R3c
9.AG.20Nipeiite-(Ce)Ce9Fe3+(SiO4)6[SiO3(OH)](OH)3Trig. 3m : R3c
9.AG.25'Yftisite-(Y)'(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6
9.AG.25Mieite-(Y)Y4Ti(SiO4)2O[F,(OH)]6Orth. mmm(2/m2/m2/m) : Cmcm
9.AG.25Trimounsite-(Y)Y2Ti2(SiO4)O5Mon. 2/m : P21/b
9.AG.30SitinakiteKNa2Ti4(SiO4)2O5(OH) · 4H2OTet. 4/mmm(4/m2/m2/m) : P42/mcm
9.AG.35KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2OHex.
9.AG.40bParanatisiteNa2Ti(SiO4)OOrth. mmm(2/m2/m2/m) : Pmma
9.AG.40aNatisiteNa2Ti(SiO4)OTet. 4/mmm(4/m2/m2/m)
9.AG.45Törnebohmite-(Ce)Ce2Al(SiO4)2(OH)Mon. 2/m : P21/b
9.AG.45Törnebohmite-(La)La2Al(SiO4)2(OH)
9.AG.50Ivanyukite-NaNa2Ti4(SiO4)3(OH)2O2 · 6H2OTrig. 3m : R3m
9.AG.50Ivanyukite-KK2Ti4(SiO4)3(OH)2O2 · 9H2OIso. 43m : P43m
9.AG.50Ivanyukite-CuCuTi4(SiO4)3(OH)2O2 · 7H2OIso. 43m : P43m
9.AG.50Kuliokite-(Y)Y4Al(SiO4)2(OH)2F5Mon. m
9.AG.50HydroxyledgrewiteCa9(SiO4)4(OH)2 Mon. 2/m : P21/b
9.AG.52Ulfanderssonite-(Ce)(Ce15Ca)Σ16Mg2(SiO4)10(SiO3OH)(OH,F)5Cl3Mon. m : Bm
9.AG.55ChantaliteCaAl2(SiO4)(OH)4Tet. 4/m : I41/a
9.AG.60VuagnatiteCaAl(SiO4)(OH)Orth. 222 : P212121
9.AG.60MozartiteCaMn3+(SiO4)(OH)Orth. 222 : P212121
9.AG.65HatruriteCa3(SiO4)OTrig.
9.AG.70JasmunditeCa11(SiO4)4O2STet. 42m : I4m2
9.AG.75AfwilliteCa3[SiO4][SiO2(OH)2] · 2H2OMon. m : Bb
9.AG.80BultfonteiniteCa2(HSiO4)F · H2OTric. 1 : P1
9.AG.85ZoltaiiteBaV4+2V3+12(SiO4)2O19Trig. 3 : P3
9.AG.90Tranquillityite(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12Hex.

Fluorescence of NeltneriteHide

In UV light:
Not fluorescent in UV

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for NeltneriteHide

References for NeltneriteHide

Localities for NeltneriteHide

Showing 12 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Bulgaria
 
  • Pazardzhik Province
    • Panagyurishte Municipality
Chavdarova et al. (2022)
Morocco (TL)
 
  • Drâa-Tafilalet Region
    • Zagora Province
      • Agdz Cercle
        • Tansifte Caïdat
Bull.Min. (1982)
Poland
 
  • Lower Silesian Voivodeship
    • Wrocław County
      • Gmina Kobierzyce
Ł. Kruszewski PXRD & pXRF data (paper in preparation)
Romania
 
  • Caraş-Severin County
    • Brebu
Hirtopanu (2006)
  • Suceava County
    • Iacobeni
minerals-of-the-carpathians.eu (2008)
South Africa
 
  • Northern Cape
    • John Taolo Gaetsewe District Municipality
      • Joe Morolong Local Municipality
Cairncross et al. (1995)
Turkey
 
  • Yozgat Province
    • Sorgun District
Oksuz (2018)
USA
 
  • Arizona
    • Cochise County
Graeme (1993)
Anthony et al. (1995)
Graeme (1993) +1 other reference
  • Michigan
    • Keweenaw County
      • Grant Township
        • Copper Harbor
Heinrich et al. (2004)
Heinrich et al. (2004)
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