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Magnesioneptunite

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About MagnesioneptuniteHide

Formula:
KNa2Li(Mg,Fe)2Ti2Si8O24
Colour:
Dark brown to red-brown
Lustre:
Vitreous
Hardness:
5 - 6
Specific Gravity:
3.15 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
After its chemical composition and its belonging to the neptunite group.

Classification of MagnesioneptuniteHide

Approved
Approval Year:
2009
9.EH.05

9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units
70.4.1.3

70 : INOSILICATES Column or Tube Structures
4 : Column or Tube Structures with linked chains forming cages

Physical Properties of MagnesioneptuniteHide

Vitreous
Transparency:
Translucent
Colour:
Dark brown to red-brown
Hardness:
5 - 6 on Mohs scale
Cleavage:
Perfect
on {110}
Density:
3.15 g/cm3 (Calculated)

Optical Data of MagnesioneptuniteHide

Type:
Biaxial (+)
RI values:
nα = 1.697(2) nβ = 1.708(3) nγ = 1.725(3)
2V:
Measured: 45° , Calculated: 78°
Max Birefringence:
δ = 0.028
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Pleochroism:
Visible
Comments:
X = light greenish brown to very light brown, Y= light brown, Z = brown

Chemical Properties of MagnesioneptuniteHide

Formula:
KNa2Li(Mg,Fe)2Ti2Si8O24

Crystallography of MagnesioneptuniteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 16.3271(7) Å, b = 12.4788(4) Å, c = 9.9666(4) Å
β = 115.6519(5)°
Ratio:
a:b:c = 1.308 : 1 : 0.799
Unit Cell V:
1830.5 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.7 (80)
4.55 (40)
3.56 (100)
2.90 (40)
2.81 (40)
2.48 (80)
2.16 (60)
1.50 (70)

Type Occurrence of MagnesioneptuniteHide

General Appearance of Type Material:
Nearly isometric grains and aggregates up to 0.1 mm in size in the cores of some grains of a Mg-rich variety of neptunite.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia (registration no. 3747/1).
Geological Setting of Type Material:
In a xenolith of altered sandstone (hornfels) located between skarnified carbonate xenoliths and ignimbrite.
Associated Minerals at Type Locality:

Synonyms of MagnesioneptuniteHide

Relationship of Magnesioneptunite to other SpeciesHide

Member of:
Other Members of this group:
ManganoneptuniteNa2KLiMn2+2Ti2Si8O24Mon.
NeptuniteNa2KLiFe2+2Ti2Si8O24Mon. m : Bb
Structurally related to group(s):

Common AssociatesHide

Associated Minerals Based on Photo Data:
Rutile2 photos of Magnesioneptunite associated with Rutile on mindat.org.
Albite2 photos of Magnesioneptunite associated with Albite on mindat.org.
Microcline2 photos of Magnesioneptunite associated with Microcline on mindat.org.
Monazite-(Ce)1 photo of Magnesioneptunite associated with Monazite-(Ce) on mindat.org.
Quartz1 photo of Magnesioneptunite associated with Quartz on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.EH.05ManganoneptuniteNa2KLiMn2+2Ti2Si8O24Mon.
9.EH.05NeptuniteNa2KLiFe2+2Ti2Si8O24Mon. m : Bb
9.EH.05WatatsumiiteNa2KLi(Mn2+,Fe2+)2V4+2[Si8O24]Mon.
9.EH.10GrumantiteNa(HSi2O5) · H2OOrth. mm2 : Fdd2
9.EH.15SarcoliteNa4Ca12Al8Si12O46(SiO4,PO4)(OH,H2O)4(CO3,Cl)Tet.
9.EH.20UssingiteNa2AlSi3O8OHTric. 1 : P1
9.EH.25Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2Trig. 3m : P3m1
9.EH.25Telyushenkoite(Cs,Na,K)Na6[F2|Be2Al3Si15O39]Trig. 3m (3 2/m) : P3 1m
9.EH.25EirikiteKNa6Be2(Si15Al3)O39F2Trig. 3m (3 2/m) : P3m1
9.EH.30NafertisiteNa3Fe2+10Ti2(Si6O17)2O2(OH)6F(H2O)2Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide

70.4.1.1NeptuniteNa2KLiFe2+2Ti2Si8O24Mon. m : Bb
70.4.1.2ManganoneptuniteNa2KLiMn2+2Ti2Si8O24Mon.

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.

References for MagnesioneptuniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Karimova, O., Yakubovich, O., Zadov, A., Gazeev, V., Pertsev, N., Ivanova, A. (2010): The crystal structure of magnesioneptunite in the context of neptunite crystal chemistry. 26th European Crystallographic Meeting 29 August- 2 September 2010, Darmstadt, Germany, Abstract, 2010, MS16-P33.
Zadov, A.E., Gazeev, V.M., Karimova, O.V., Pertsev, K.N., Pekov, I.V., Galuskin, E.V., Galuskina, I.O., Gurbanov, A.G., Belakovsky, D.I., Borisovsky, S.E., Kartashev, P.M., Ivanova, A.G., Yakubovich, O.V. (2011): Magnesioneptunite KNa2Li(Mg,Fe)2Ti2Si8O24 - a new mineral of the neptunite group. Zapiski Rossiiskogo Mineralogicheskogo Obshchestva (Proceedings of the Russian Mineralogical Society), 140(1), 57-66 (in Russian). English translation: Geology of Ore Deposits, 53, 775-782.
Karimova, O.V., Yakubovich, O.V., Zadov, A. E., Ivanova, A. G. and Urusov, V.S. (2012), The crystal structure of the new mineral magnesioneptunite, Crystallography Reports, 57(4),505-513.

Internet Links for MagnesioneptuniteHide

Localities for MagnesioneptuniteHide

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 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Russia
 
  • Northern Caucasus Region
    • Kabardino-Balkarian Republic
      • Baksan Valley
        • Upper Chegem volcanic caldera (Verkhnechegemskaya caldera)
Zadov, A.E., Gazeev, V.M., Karimova, O.V., Pertsev, K.N., Pekov, I.V., Galuskin, E.V., Galuskina, I.O., Gurbanov, A.G., Belakovsky, D.I., Borisovsky, S.E., Kartashev, P.M., Ivanova, A.G., Yakubovich, O.V. (2011): Magnesioneptunite KNa2Li(Mg,Fe)2Ti2Si8O24 - a new mineral of the neptunite group. Zapiski Rossiiskogo Mineralogicheskogo Obshchestva (Proceedings of the Russian Mineralogical Society), 140, 57-66.
Zadov, A.E., Gazeev, V.M., Karimova, O.V., Pertsev, K.N., Pekov, I.V., Galuskin, E.V., Galuskina, I.O., Gurbanov, A.G., Belakovsky, D.I., Borisovsky, S.E., Kartashev, P.M., Ivanova, A.G., Yakubovich, O.V. (2011): Magnesioneptunite KNa2Li(Mg,Fe)2Ti2Si8O24 - a new mineral of the neptunite group. Zapiski Rossiiskogo Mineralogicheskogo Obshchestva (Proceedings of the Russian Mineralogical Society), 140(1), 57-66 (in Russian). English translation: Geology of Ore Deposits, 53, 775-782.
Mineral and/or Locality  
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