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Nafertisite

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Formula:
Na3Fe2+10Ti2(Si6O17)2O2(OH)6F(H2O)2
Lustre:
Vitreous
Hardness:
2 - 3
Crystal System:
Monoclinic
Related to caryochroite. Closely related to astrophyllite group.

The structure is based on The HOH layers (H - heteropolyhedral, O - octahedral), that are set in alternation with intermediate (I) blocks along c. The O sheet, ideal composition Fe2+10M, is built of M(1–3) octahedra. The H sheet comprises of nafertisite Si6O17 ribbons (there are 2 such ribbons pfu) and Ti-dominant D octahedra. In the I block, the A, B, C and W sites have the following occupancy (Kukisvumchorr material): (Na1.39K0.61), Na, (□0.92Rb0.06Cs0.02). and [(H2O)1.390.61] pfu, respectively. The ideal chemical composition of the I block, general formula A2BCW, Na3(H2O)2 pfu.


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Classification of NafertisiteHide

Approved
9.EH.30

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

Physical Properties of NafertisiteHide

Vitreous
Hardness:
2 - 3 on Mohs scale

Optical Data of NafertisiteHide

Type:
Biaxial (-)
RI values:
nα = 1.627 nβ = 1.667 nγ = 1.693
2V:
Measured: 75° to 76°, Calculated: 76°
Max Birefringence:
δ = 0.066
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v or r < v

Chemical Properties of NafertisiteHide

Formula:
Na3Fe2+10Ti2(Si6O17)2O2(OH)6F(H2O)2
IMA Formula:
Na3Fe2+10Ti4+2(Si6O17)2O2(OH)6F · 2H2O

Crystallography of NafertisiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Cell Parameters:
a = 5.358(1) Å, b = 16.204(3) Å, c = 21.976(4) Å
β = 94.91(1)°
Ratio:
a:b:c = 0.331 : 1 : 1.356
Unit Cell V:
1901 ų
Comment:
A2/m

Type Occurrence of NafertisiteHide

Synonyms of NafertisiteHide

Other Language Names for NafertisiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Aegirine4 photos of Nafertisite associated with Aegirine on mindat.org.
Albite4 photos of Nafertisite associated with Albite on mindat.org.
Analcime1 photo of Nafertisite associated with Analcime 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.05MagnesioneptuniteKNa2Li(Mg,Fe)2Ti2Si8O24Mon. 2/m : B2/b
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

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 NafertisiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Mineralogical Record: 28: 143.
Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 124(6): 101-107.
European Journal of Mineralogy: 8: 241-249.
Petersen, O.V., Johnsen, O., Christiansen, C.C., Robinson, G.W. & Niedermayr, G. (1999): Nafertisite - Na3Fe10Ti2Si12(O,OH,F)43 - from the Nanna pegmatite, Narsaarsuup Qaava, South Greenland. Neues Jahrbuch für Mineralogie, Monatshefte, 1999, 303-310.
Cámara, F., Sokolova, E., Abdu, Y.A., Hawthorne, F.C. (2014): Nafertisite, Na3Fe2+10Ti2(Si6O17)2O2(OH)6F(H2O)2, from Mt. Kukisvumchorr, Khibiny alkaline massif, Kola peninsula, Russia: Refinement of the crystal structure and revision of the chemical formula. European Journal of Mineralogy: 26(5): 689-700

Internet Links for NafertisiteHide

Localities for NafertisiteHide

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.
Greenland
 
  • Kujalleq
    • Narsaq
      • Igaliku (Igaliko)
        • Narsaarsuup Qaava
Petersen, O.V., Johnsen, O., Christiansen, C.C., Robinson, G.W. & Niedermayr, G. (1999): Nafertisite - Na3Fe10Ti2Si12(O,OH,F)43 - from the Nanna pegmatite, Narsaarsuup Qaava, South Greenland. Neues Jahrbuch für Mineralogie, Monatshefte, 1999, 303-310.
Russia (TL)
 
  • Northern Region
    • Murmanskaya Oblast'
      • Khibiny Massif
ZVMO,(1995) 124, n. 6, 101-107
www.koeln.netsurf.de/~w.steffens/lovo.htm
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