Neltnerite
A valid IMA mineral species
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About Neltnerite
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.
Type Locality:
Isostructural with:
Black pyramidal crystals, also complex elongated crystals.
Unique Identifiers
Mindat ID:
2875
Long-form identifier:
mindat:1:1:2875:8
GUID
(UUID V4):
(UUID V4):
a28f6bcc-374b-495e-a910-05963d1fbafc
IMA Classification of Neltnerite
Approved
IMA Formula:
CaMn3+6O8(SiO4)
Approval year:
1979
First published:
1982
Classification of Neltnerite
9.AG.05
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
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
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
14 : Silicates not Containing Aluminum
18 : Silicates of Mn and Na, K, Mg, Ca or Fe
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Nel | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Neltnerite
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 Neltnerite
Anisotropism:
Weak
Reflectivity:
Wavelength | R1 | R2 |
---|---|---|
470nm | 21.3% | 22.3% |
546nm | 19.2% | 20.2% |
589nm | 18.5% | 19.5% |
650nm | 17.65% | 18.65% |
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 Neltnerite
Mindat Formula:
CaMn3+6(SiO4)O8
Elements listed:
Common Impurities:
Fe
Crystallography of Neltnerite
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 Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0006420 | Neltnerite | de 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 3 567-573 | 1991 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
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 Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47e : [Vanadates, chromates, manganates] | |
47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Neltnerite
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 Neltnerite
Other Language Names for Neltnerite
Relationship of Neltnerite to other Species
Member of:
Other Members of this group:
Abswurmbachite | CuMn3+6(SiO4)O8 | Tet. 4/mmm (4/m 2/m 2/m) : I41/acd |
Braunite | Mn2+Mn3+6(SiO4)O8 | Tet. 4/mmm (4/m 2/m 2/m) : I41/acd |
Braunite-II | CaMn3+14(SiO4)O20 | Tet. 4/mmm (4/m 2/m 2/m) : I41/acd |
Gatedalite | ZrMn2+2Mn3+4SiO12 | Tet. 4/mmm (4/m 2/m 2/m) : I41/acd |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
9.AG. | Ivanyukite-Na-T | Na2Ti4(SiO4)3(OH)O3 · 7H2O |
9.AG. | Ivanyukite-Na-C | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
9.AG. | Edgrewite | Ca9(SiO4)4F2 |
9.AG. | Aluminotaipingite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4F3 |
9.AG.02 | Gatedalite | ZrMn2+2Mn3+4SiO12 |
9.AG.05 | Abswurmbachite | CuMn3+6(SiO4)O8 |
9.AG.05 | Braunite | Mn2+Mn3+6(SiO4)O8 |
9.AG.05 | Braunite-II | CaMn3+14(SiO4)O20 |
9.AG.10 | Långbanite | Mn2+4Mn3+9Sb5+O16(SiO4)2 |
9.AG.12 | Taipingite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3[SiO3(OH)]4F3 |
9.AG.15 | Malayaite | CaSn(SiO4)O |
9.AG.15 | Titanite | CaTi(SiO4)O |
9.AG.15 | Vanadomalayaite | CaV4+(SiO4)O |
9.AG.15 | Natrotitanite | (Na0.5Y0.5)Ti(SiO4)O |
9.AG.15 | Żabińskiite | Ca[Al0.5(Ta,Nb)0.5)](SiO4)O |
9.AG.20 | Cerite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3(SiO3OH)4(OH)3 |
9.AG.20 | Ferricerite-(LaCa) | (La6Ca3)◻Fe3+(SiO4)3(SiO3OH)4(OH)3 |
9.AG.20 | Aluminocerite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4(OH)3 |
9.AG.25 | Trimounsite-(Y) | Y2Ti2(SiO4)O5 |
9.AG.25 | Yftisite-(Y) | (Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6 |
9.AG.25 | Mieite-(Y) | Y4Ti(SiO4)2O[F,(OH)]6 |
9.AG.30 | Sitinakite | KNa2Ti4(SiO4)2O5(OH) · 4H2O |
9.AG.35 | Kittatinnyite | Ca2Mn2Mn(SiO4)2(OH)4 · 9H2O |
9.AG.40a | Natisite | Na2Ti(SiO4)O |
9.AG.40b | Paranatisite | Na2Ti(SiO4)O |
9.AG.45 | Törnebohmite-(Ce) | Ce2Al(SiO4)2(OH) |
9.AG.45 | Törnebohmite-(La) | La2Al(SiO4)2(OH) |
9.AG.50 | Kuliokite-(Y) | Y4Al(SiO4)2(OH)2F5 |
9.AG.50 | Ivanyukite-Na | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
9.AG.50 | Ivanyukite-K | K2Ti4(SiO4)3(OH)2O2 · 9H2O |
9.AG.50 | Ivanyukite-Cu | CuTi4(SiO4)3(OH)2O2 · 7H2O |
9.AG.50 | Hydroxyledgrewite | Ca9(SiO4)4(OH)2 |
9.AG.52 | Ulfanderssonite-(Ce) | (Ce15Ca)Σ16Mg2(SiO4)10(SiO3OH)(OH,F)5Cl3 |
9.AG.55 | Chantalite | CaAl2(SiO4)(OH)4 |
9.AG.60 | Mozartite | CaMn3+(SiO4)(OH) |
9.AG.60 | Vuagnatite | CaAl(SiO4)(OH) |
9.AG.65 | Hatrurite | Ca3(SiO4)O |
9.AG.70 | Jasmundite | Ca11(SiO4)4O2S |
9.AG.75 | Afwillite | Ca3(HSiO4)2 · 2H2O |
9.AG.80 | Bultfonteinite | Ca2(HSiO4)F · H2O |
9.AG.85 | Zoltaiite | BaV4+2V3+12(SiO4)2O19 |
9.AG.90 | Tranquillityite | (Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12 |
Fluorescence of Neltnerite
Not fluorescent in UV
Other Information
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 Neltnerite
mindat.org URL:
https://www.mindat.org/min-2875.html
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References for Neltnerite
Reference List:
Baudracco-Gritti, Célestine, Caye, René, Permingeat, François, Protas, Jean (1982) La neltnérite CaMn6SiO12, une nouvelle espèce minérale du groupe de la braunite. Bulletin de Minéralogie, 105 (2) 161-165 doi:10.3406/bulmi.1982.7598
Localities for Neltnerite
Locality List
- 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.
All localities listed without proper references should be considered as questionable.
Bulgaria | |
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Morocco (TL) | |
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Poland | |
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Romania | |
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South Africa | |
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Turkey | |
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USA | |
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