Manganoneptunite
A valid IMA mineral species - grandfathered
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About Manganoneptunite
Formula:
KNa2Li(Mn2+)2Ti2[Si4O12]2
Colour:
Red
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
3.17 - 3.20
Crystal System:
Monoclinic
Member of:
Name:
For being the manganese analogue of neptunite. The earlier name was mangan-neptunite, but it was changed to manganoneptunite by the IMA in 2008 (Burke 2008).
Unique Identifiers
Mindat ID:
2564
Long-form identifier:
mindat:1:1:2564:1
GUID
(UUID V4):
(UUID V4):
2afbe83f-2150-428b-99b4-1f5a5d11fe12
IMA Classification of Manganoneptunite
Approved, 'Grandfathered' (first described prior to 1959)
IMA status notes:
Renamed by the IMA
IMA Formula:
KNa2LiMn2+2Ti2Si8O24
First published:
1923
Classification of Manganoneptunite
9.EH.05
9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units
9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units
Dana 7th ed.:
70.4.1.2
70.4.1.2
70 : INOSILICATES Column or Tube Structures
4 : Column or Tube Structures with linked chains forming cages
70 : INOSILICATES Column or Tube Structures
4 : Column or Tube Structures with linked chains forming cages
14.9.27
14 : Silicates not Containing Aluminum
9 : Silicates of Ti
14 : Silicates not Containing Aluminum
9 : Silicates of Ti
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 |
---|---|---|
Mnnpt | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Manganoneptunite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Manganoneptunite
Vitreous
Transparency:
Translucent
Colour:
Red
Streak:
Brick-red, reddish brown.
Hardness:
5 - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Distinct in two directions, intersecting at ~80°.
Distinct in two directions, intersecting at ~80°.
Fracture:
Irregular/Uneven, Conchoidal
Density:
3.17 - 3.20 g/cm3 (Measured) 3.26 g/cm3 (Calculated)
Optical Data of Manganoneptunite
Type:
Biaxial (+)
RI values:
nα = 1.691 - 1.697 nβ = 1.693 - 1.700 nγ = 1.713 - 1.728
2V:
Measured: 31° to 36°, Calculated: 40°
Max Birefringence:
δ = 0.022 - 0.031
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v strong
Optical Extinction:
Y = b; Z ∧ c = 16°-20°.
Pleochroism:
Strong
Comments:
X = light yellow; Y = orange or yellow-orange; Z = red-orange.
Comments:
Absorption: Z > Y > X.
Chemistry of Manganoneptunite
Mindat Formula:
KNa2Li(Mn2+)2Ti2[Si4O12]2
Crystallography of Manganoneptunite
Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Space Group:
Bb
Setting:
Cc
Cell Parameters:
a = 16.4821(6) Å, b = 12.5195(4) Å, c = 10.0292(3) Å
β = 115.474(1)°
β = 115.474(1)°
Ratio:
a:b:c = 1.317 : 1 : 0.801
Unit Cell V:
1868.31 ų
Morphology:
Prismatic crystals, elongated along [001]. Forms include {110}, {001}, {100}. Also {111}, {111} and rare {210}.
Twinning:
Contact twinning on {001}.
Crystal Structure
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Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
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CIF File Best | x | y | z | a | b | c
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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) |
---|---|---|---|---|---|---|---|
0018809 | Manganoneptunite | Borisov S V, Klevtsova R F, Bakakin V V, Belov N V (1966) The crystal structure of neptunite Soviet Physics Crystallography 10 684-689 | 1966 | Lovozero, Russia | 0 | 293 | |
0015717 | Manganoneptunite | Zolotarev A A, Krivovichev S V, Yakovenchuk V N (2007) Refinement of the mangan-neptunite structure Zapiski Vserossijskogo Mineralogicheskogo Obshchestva 136 118-123 | 2007 | Mt. Kaskasnyuncharr, the Khibiny alkaline pluton, Russia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
2.485 Å | (100) |
1.506 Å | (100) |
1.483 Å | (90) |
2.170 Å | (80) |
1.924 Å | (70) |
2.841 Å | (60) |
2.948 Å | (50) |
Comments:
Lovozero massif, Russia.
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 4b: Highly evolved igneous rocks | >3.0 |
35 : Ultra-alkali and agpaitic igneous rocks |
Type Occurrence of Manganoneptunite
General Appearance of Type Material:
Dark cherry-red crystalline granular aggregates, some of significant size and included with aegirine.
Place of Conservation of Type Material:
No designated type material.
Geological Setting of Type Material:
Pegmatite in nepheline syenite.
Associated Minerals at Type Locality:
Reference:
Kurbatov, S.M. (1923): Analyse d'une neptounite manganifère des Monts Chibines en Laponie russe. Comptes Rendus de l’Académie des Sciences de Russie, 1, 59-60.
Synonyms of Manganoneptunite
Other Language Names for Manganoneptunite
Relationship of Manganoneptunite to other Species
Member of:
Other Members of this group:
Magnesioneptunite | KNa2Li(Mg)2Ti2[Si4O12]2 | Mon. 2/m : B2/b |
Neptunite | KNa2Li(Fe2+)2Ti2[Si4O12]2 | Mon. m : Bb |
Rotherkopfite | KNa2Fe2+(Fe2+)2(Ti1.5Fe2+0.5)[Si4O12]2 | Mon. 2/m : B2/b |
Watatsumiite | KNa2Li(Mn2+)2V4+2[Si4O12]2 | Mon. m : Bb |
Forms a series with:
Common Associates
Associated Minerals Based on Photo Data:
65 photos of Manganoneptunite associated with Serandite | NaMn2+2Si3O8(OH) |
58 photos of Manganoneptunite associated with Aegirine | NaFe3+Si2O6 |
25 photos of Manganoneptunite associated with Catapleiite | Na2Zr(Si3O9) · 2H2O |
25 photos of Manganoneptunite associated with Albite | Na(AlSi3O8) |
24 photos of Manganoneptunite associated with Shkatulkalite | Na2Nb2Na3Ti(Si2O7)2O2(FO)(H2O)4(H2O)3 |
22 photos of Manganoneptunite associated with Natrolite | Na2Al2Si3O10 · 2H2O |
21 photos of Manganoneptunite associated with Microcline | K(AlSi3O8) |
20 photos of Manganoneptunite associated with Analcime | Na(AlSi2O6) · H2O |
19 photos of Manganoneptunite associated with Ussingite | Na2AlSi3O8OH |
18 photos of Manganoneptunite associated with Eudialyte Group | [N(1)N(2)N(3)N(4)N(5)]3[M(1.1)M(1.2)]3[M(2.1)M(2.2)M(2.3)]3-6[M(3)M(4)]Z3[Si24O72]Θ4X(1)X(2) |
Related Minerals - Strunz-mindat Grouping
9.EH.05 | Neptunite | KNa2Li(Fe2+)2Ti2[Si4O12]2 |
9.EH.05 | Watatsumiite | KNa2Li(Mn2+)2V4+2[Si4O12]2 |
9.EH.05 | Magnesioneptunite | KNa2Li(Mg)2Ti2[Si4O12]2 |
9.EH.05 | Rotherkopfite | KNa2Fe2+(Fe2+)2(Ti1.5Fe2+0.5)[Si4O12]2 |
9.EH.10 | Grumantite | Na(HSi2O5) · H2O |
9.EH.15 | Sarcolite | Na4Ca12Al8Si12O46(SiO4,PO4)(OH,H2O)4(CO3,Cl) |
9.EH.20 | Ussingite | Na2AlSi3O8OH |
9.EH.25 | Leifite | (Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2 |
9.EH.25 | Telyushenkoite | (Cs,Na,K)Na6[Be2Al3Si15O39]F2 |
9.EH.25 | Eirikite | KNa6Be2(Si15Al3)O39F2 |
9.EH.30 | Nafertisite | Na3Fe2+10Ti2(Si6O17)2O2(OH)6F(H2O)2 |
9.EH.35 | Veblenite | KNa(Fe2+5Fe3+4Mn7)Nb4(Si2O7)2(Si8O22)2O6(OH)10(H2O)3 |
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 Manganoneptunite
mindat.org URL:
https://www.mindat.org/min-2564.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Manganoneptunite
Localities for Manganoneptunite
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.
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Demix-Varennes quarry, Saint-Amable sill, Varennes & St-Amable, Lajemmerais RCM, Montérégie, Québec, Canada