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Neltnerite

A valid IMA mineral species
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About NeltneriteHide

01341170014946701383282.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:
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:
Black pyramidal crystals, also complex elongated crystals.


Unique IdentifiersHide

Mindat ID:
2875
Long-form identifier:
mindat:1:1:2875:8
GUID
(UUID V4):
a28f6bcc-374b-495e-a910-05963d1fbafc

IMA Classification of NeltneriteHide

Classification of NeltneriteHide

9.AG.05

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

7 : MULTIPLE OXIDES
5 : (AB)2X3
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
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

Adamantine, Sub-Adamantine
Transparency:
Opaque
Colour:
Black
Streak:
Black
Hardness:
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:
WavelengthR1R2
470nm21.3%22.3%
546nm19.2%20.2%
589nm18.5%19.5%
650nm17.65%18.65%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. 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
Common Impurities:
Fe

Crystallography of NeltneriteHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/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

General Appearance of Type Material:
Dipyramidal crystals, to 1 mm
Place of Conservation of Type Material:
National School of Mines, Paris, France
Associated Minerals at Type Locality:
Reference:
Baudracco-Gritti, C., Caye, R., Permingeat, F., Protas, J. (1982) La neltnérite CaMn6SiO12, une nouvelle espèce minérale du groupe de la braunite. Bulletin de Minéralogie: 105: 161-165.

Synonyms of NeltneriteHide

Other Language Names for NeltneriteHide

Relationship of Neltnerite to other SpeciesHide

Member of:
Other Members of this group:
AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
BrauniteMn2+Mn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
Braunite-IICaMn3+14(SiO4)O20Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
GatedaliteZrMn2+2Mn3+4SiO12Tet. 4/mmm (4/m 2/m 2/m) : I41/acd

Common AssociatesHide

Associated Minerals Based on Photo Data:
1 photo of Neltnerite associated with TangeiteCaCu(VO4)(OH)
1 photo of Neltnerite associated with OrientiteCa8Mn3+10(SiO4)3(Si3O10)3(OH)10 · 4H2O

Related Minerals - Strunz-mindat GroupingHide

9.AG.Ivanyukite-Na-TNa2Ti4(SiO4)3(OH)O3 · 7H2OTrig. 3m : R3m
9.AG.Ivanyukite-Na-CNa2Ti4(SiO4)3(OH)2O2 · 6H2OIso. 4 3m : P4 3m
9.AG.EdgrewiteCa9(SiO4)4F2 Mon. 2/m : P21/b
9.AG.Aluminotaipingite-(CeCa)(Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4F3Trig. 3m : R3c
9.AG.02GatedaliteZrMn2+2Mn3+4SiO12Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AG.05AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AG.05BrauniteMn2+Mn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AG.05Braunite-IICaMn3+14(SiO4)O20Tet. 4/mmm (4/m 2/m 2/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.15MalayaiteCaSn(SiO4)OMon. 2/m
9.AG.15TitaniteCaTi(SiO4)OMon. 2/m : P21/b
9.AG.15VanadomalayaiteCaV4+(SiO4)OMon. 2/m : B2/b
9.AG.15Natrotitanite(Na0.5Y0.5)Ti(SiO4)OMon. 2/m : B2/b
9.AG.15ŻabińskiiteCa[Al0.5(Ta,Nb)0.5)](SiO4)OTric. 1
9.AG.20Cerite-(CeCa)(Ce7Ca2)◻Mg(SiO4)3(SiO3OH)4(OH)3Trig. 3m : R3c
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.25Trimounsite-(Y)Y2Ti2(SiO4)O5Mon. 2/m : P21/b
9.AG.25Yftisite-(Y)(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6
9.AG.25Mieite-(Y)Y4Ti(SiO4)2O[F,(OH)]6Orth. mmm (2/m 2/m 2/m) : Cmcm
9.AG.30SitinakiteKNa2Ti4(SiO4)2O5(OH) · 4H2OTet. 4/mmm (4/m 2/m 2/m) : P42/mcm
9.AG.35KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2OHex.
9.AG.40aNatisiteNa2Ti(SiO4)OTet. 4/mmm (4/m 2/m 2/m)
9.AG.40bParanatisiteNa2Ti(SiO4)OOrth. mmm (2/m 2/m 2/m) : Pmma
9.AG.45Törnebohmite-(Ce)Ce2Al(SiO4)2(OH)Mon. 2/m : P21/b
9.AG.45Törnebohmite-(La)La2Al(SiO4)2(OH)
9.AG.50Kuliokite-(Y)Y4Al(SiO4)2(OH)2F5Tric. 1 : P1
9.AG.50Ivanyukite-NaNa2Ti4(SiO4)3(OH)2O2 · 6H2OTrig. 3m : R3m
9.AG.50Ivanyukite-KK2Ti4(SiO4)3(OH)2O2 · 9H2OIso. 4 3m : P4 3m
9.AG.50Ivanyukite-CuCuTi4(SiO4)3(OH)2O2 · 7H2OIso. 4 3m : P4 3m
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.60MozartiteCaMn3+(SiO4)(OH)Orth. 2 2 2 : P21 21 21
9.AG.60VuagnatiteCaAl(SiO4)(OH)Orth. 2 2 2 : P21 21 21
9.AG.65HatruriteCa3(SiO4)OTrig.
9.AG.70JasmunditeCa11(SiO4)4O2STet. 4 2m : I4m2
9.AG.75AfwilliteCa3(HSiO4)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

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

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.

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
Morocco (TL)
 
  • Drâa-Tafilalet Region
    • Zagora Province
      • Agdz Cercle
        • Tansifte Caïdat
Poland
 
  • Lower Silesian Voivodeship
    • Wrocław County
      • Gmina Kobierzyce
Romania
 
  • Caraş-Severin County
    • Brebu
  • Suceava County
    • Iacobeni
South Africa
 
  • Northern Cape
    • John Taolo Gaetsewe District Municipality
      • Joe Morolong Local Municipality
        • Hotazel
Turkey
 
  • Yozgat Province
    • Sorgun District
USA
 
  • Arizona
    • Cochise County
  • Michigan
    • Keweenaw County
      • Grant Township
        • Copper Harbor
 
Mineral and/or Locality  
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