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2 - 3
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.

Classification of Nafertisite


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

Physical Properties of Nafertisite

Hardness (Mohs):
2 - 3

Optical Data of Nafertisite

Biaxial (-)
RI values:
nα = 1.627 nβ = 1.667 nγ = 1.693
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:
r > v or r < v

Chemical Properties of Nafertisite

IMA Formula:
Na3Fe102+Ti24+(Si6O17)2O2(OH)6F · 2H2O
Elements listed in formula:

Crystallography of Nafertisite

Crystal System:
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)°
a:b:c = 0.331 : 1 : 1.356
Unit Cell Volume:
V 1901 ų

Type Occurrence of Nafertisite

Relationship of Nafertisite to other Species

9.EH.10GrumantiteNa(HSi2O5) · H2O

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.

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 Nafertisite URL:
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The following Nafertisite specimens are currently listed for sale on

Localities for Nafertisite

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.
(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.
  • 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
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
ZVMO,(1995) 124, n. 6, 101-107
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