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Nafertisite

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Formula:
Na3(Fe2+)10Ti2(Si6O17)2O2(OH)6F(2H2O)2
System:
Monoclinic
Lustre:
Vitreous
Hardness:
2 - 3
This page provides mineralogical data about Nafertisite.

Classification of Nafertisite

Approved
9.EH.30

9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units
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First Recorded Occurrence of Nafertisite

Physical Properties of Nafertisite

Vitreous
Hardness (Mohs):
2 - 3

Crystallography of Nafertisite

Crystal System:
Monoclinic

Optical Data of Nafertisite

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 Nafertisite

Formula:
Na3(Fe2+)10Ti2(Si6O17)2O2(OH)6F(2H2O)2
Essential elements:
All elements listed in formula:

Relationship of Nafertisite to other Species

9.EH.05ManganoneptuniteNa2KLi(Mn2+,Fe2+)2Ti2[Si8O24]
9.EH.05NeptuniteNa2KLi(Fe2+,Mn2+)2Ti2(Si8O24)
9.EH.05WatatsumiiteNa2KLi(Mn2+,Fe2+)2V24+[Si8O24]
9.EH.05MagnesioneptuniteKNa2Li(Mg,Fe)2Ti2Si8O24
9.EH.10GrumantiteNa(HSi2O5) · H2O
9.EH.15SarcoliteNa2Ca12(Ca,K,Fe,Sr,Mg)2Al8Si12(P,Si)O52F2
9.EH.20UssingiteNa2AlSi3O8OH
9.EH.25Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2
9.EH.25Telyushenkoite(Cs,Na,K)Na6[F2|Be2Al3Si15O39]
9.EH.25EirikiteKNa6Be2(Si15Al3)O39F2

Other Names for Nafertisite

Name in Other Languages:

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.

References for Nafertisite

Reference List:
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.

Internet Links for Nafertisite

Localities for Nafertisite

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
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
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
ZVMO,(1995) 124, n. 6, 101-107
www.koeln.netsurf.de/~w.steffens/lovo.htm
Mineral and/or Locality  
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