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Na2(Fe3+,Mn2+)3Si8O20(OH)2 · 4H2O
Golden-yellow, reddish ...
Silky, Dull
Named after its discovery locality, Tuperssuatsiat Bay, Illimaussaq complex, Narsaq municipality, Greenland.
Palygorskite Group.

At least two visually similar, isomorphous species are known (Cámara et al., 2002). See also windhoekite.

Classification of Tuperssuatsiaite

Approval Year:

9 : SILICATES (Germanates)
E : Phyllosilicates
E : Single tetrahedral nets of 6-membered rings connected by octahedral nets or octahedral bands
Dana 7th ed.:

74 : PHYLLOSILICATES Modulated Layers
3 : Modulated Layers with joined strips

14 : Silicates not Containing Aluminum
20 : Silicates of Fe and alkali metals

Physical Properties of Tuperssuatsiaite

Silky, Dull
Diaphaneity (Transparency):
Golden-yellow, reddish brown, orange-yellow
Brownish Yellow
Good on the {100}
2.465 g/cm3 (Measured)    2.12 g/cm3 (Calculated)

Optical Data of Tuperssuatsiaite

Biaxial (+)
RI values:
nα = 1.539 nβ = 1.560 nγ = 1.595
Measured: 103° to 103°, Calculated: 78°
Max Birefringence:
δ = 0.056
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of Tuperssuatsiaite

IMA Formula:
Na2(Fe3+,Mn2+)3Si8O20(OH)2 · 4H2O
Elements listed in formula:
Common Impurities:

Crystallography of Tuperssuatsiaite

Crystal System:
Class (H-M):
2/m - Prismatic
Space Group:
Cell Parameters:
a = 13.72 Å, b = 18 Å, c = 4.82 Å
β = 104.28°
a:b:c = 0.762 : 1 : 0.268
Unit Cell Volume:
V 1280.91 ų
X-Ray Powder Diffraction Data:
10.82 (10)
4.140 (2)
3.395 (3)
2.638 (4)
2.544 (3)
2.510 (3)
2.235 (3)

Type Occurrence of Tuperssuatsiaite

Relationship of Tuperssuatsiaite to other Species

Other Members of Group:
Palygorskite(Mg,Al)5(Si,Al)8O20(OH)2 · 8H2O
Unnamed (Na-Ca-Fe-Silicate-Hydrate)NaCa(Fe2+,Al,Mn)5[Si8O19(OH)](OH)7 · 5H2O
WindhoekiteCa2Fe3+2.67[Si8O20](OH)4 · 10H2O
YofortieriteMn5Si8O20(OH)2 · 8-9H2O
9.EE.20Palygorskite(Mg,Al)2Si4O10(OH) · 4H2O
9.EE.20Yofortierite(Mn2+,Mg,Fe3+)5Si8O20(OH,H2O)2 · 7H2O
9.EE.20WindhoekiteCa2Fe3+2.67(Si8O20)(OH)4 · 10H2O
9.EE.25FalcondoiteNi4Si6O15(OH)2 · 6H2O
9.EE.25LoughliniteNa2Mg3Si6O16 · 8H2O
9.EE.25SepioliteMg4Si6O15(OH)2 · 6H2O
9.EE.25KalifersiteK5Fe73+Si20O50(OH)6 · 12H2O
9.EE.30GyroliteNaCa16(Si23Al)O60(OH)8 · 14H2O
9.EE.30OrlymaniteCa4Mn32+Si8O20(OH)6 · 2H2O
9.EE.35ReyeriteNa2Ca14Al2Si22O58(OH)8 · 6H2O
9.EE.35TruscottiteCa14Si24O58(OH)8 · 2H2O
9.EE.45MakatiteNa2Si4O8(OH)2 · 4H2O
9.EE.50VarennesiteNa8(Mn,Fe3+,Ti)2Si10O25(OH,Cl)2 · 12H2O
9.EE.55RaiteNa3Mn32+Ti0.25Si8O20(OH)2 · 10H2O
9.EE.60IntersiliteNa6Mn(Ti,Nb)Si10(O,OH)28 · 4H2O
9.EE.65ShafranovskiteNa3K2(Mn,Fe,Na)4[Si9(O,OH)27](OH)2 · nH2O
9.EE.65ZakharoviteNa4Mn52+Si10O24(OH)6 · 6H2O
9.EE.70ZeophylliteCa13Si10O28(OH)2F8 · 6H2O
9.EE.80Fedorite(K,Na)2.5(Ca,Na)7Si16O38(OH,F)2 · 3.5H2O
9.EE.80Martinite(Na,◻,Ca)12Ca4(Si,S,B)14B2O38(OH,Cl)2F2 · 4H2O
9.EE.85Lalondeite(Na,Ca)6(Ca,Na)3Si16O38(F,OH)2 · 3H2O
14.20.7 Ferri-anniteKFe32+((Fe3+,Al)Si3O10)(OH)2

Other Names for Tuperssuatsiaite

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 Tuperssuatsiaite

Reference List:
Karup-Møller, S., Petersen, O.V. (1984): Tuperssuatsiaite, a new mineral species from the Ilímaussaq intrusion in South Greenland, Neues Jahrbuch für Mineralogie, Monatshefte, 1984, 501-512.

American Mineralogist (1985): 70: 1332. (Abs.)

von Knorring, O., Petersen, O. V. Karup-Moeller, S., Leonardsen, E. S. and Condliffe, E. (1992): Tuperssuatsiaite, from Aris phonolite, Windhoek, Namibia. Neues Jahrbuch für Mineralogie Monatsh., 1992, 145-152.

American Mineralogist (1992): 77: 1308. (Abs.)

Mineralogical Record (1998): 29: 109.

Cámara, F., Garvie, L. A. J., Devouard, B., Groy, T. L. and Buseck, P. R. (2002): The structure of Mn-rich tuperssuatsiaite: A palygorskite-related mineral. Am. Mineral. 87, 1458-1463.

Internet Links for Tuperssuatsiaite URL:
Please feel free to link to this page.
The following Tuperssuatsiaite specimens are currently listed for sale on

Localities for Tuperssuatsiaite

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.
  • Minas Gerais
    • Poços de Caldas alkaline complex
      • Poços de Caldas
Atencio, D. , Coutinho, J.M.V. and Vlach, S.R.F. (2005). "Tuperssuatsiaite from the Bortolan quarry, Poços de Caldas, Minas Gerais, Brazil." The Mineralogical Record, 36(3),pp:275-280.
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
HORVÁTH, L. and HORVÁTH-PFENNINGER, E. (2000) Die Mineralien des Mont Saint-Hilaire. Lapis, 25, Nr. 7/8, 23-61 (in German).; HORVÁTH, L., PFENNINGER‑HORVÁTH, E. (2000) I minerali di Mont-Saint-Hilaire (Québec, Canada) Rivista Mineralogica Italiana, XXIV, 140-202 (in Italian with English summary).
      • Lajemmerais RCM
        • Varennes & St-Amable
HORVÁTH, L., PFENNINGER HORVÁTH, E., GAULT, R.A., and TARASSOFF, P. (1998) Mineralogy of the Saint Amable sill, Varennes and Saint Amable, Québec, Canada. Mineralogical Record, 29, 83 118.
Horváth, L., Pfenninger-Horváth, E., Gault, R. A., & Tarassoff, P. (1998): Mineralogy of the Saint-Amable Sill, Varennes and Saint-Amable, Québec. Mineralogical Record, 29: 83-118.
  • Kujalleq
    • Narsaq
Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33
        • Kangerluarsuk Fjord (Kangerdluarssuq Fjord)
          • Head of Kangerluarsuk
            • Lilleelv
Knut Edvard Larsen collection # 1107 ( Ex Hans Vidar Ellingsen & Astrid Haugen collection)
Pekov, I.V. et al. (2002): Karupmollerite-Ca, (Na,Ca,K)2Ca(Nb,Ti)4(Si4O12)2(O,OH)4.7H2O, a new mineral of the labuntsovite group from the Ilimaussaq alkaline complex, South Greenland, Neues Jahrbuch für Mineralogie, Monatshefte, Vol. 10, 433-444
Min Rec 36:3 pp275-280
Karup-Møller, S. & Petersen. O. V. (1984): Tuperssuatsiaite, a new mineral species from the Ilímaussaq intrusion in South Greenland, Neues Jahrbuch für Mineralogie, Monatshefte. 1984. 501-512; Min Rec 36:3 pp275-280
  • Khomas Region
    • Windhoek District
      • Aris
von Knorring, O. and Franke, W. (1987): A preliminary note on the mineralogy and geochemistry of the Aris phonolite, SWA/Namibia. Communications of the Geological Survey of South West Africa / Namibia, 3, 65 [as "unknown iron silicate"]; von Knorring, O., Petersen, O. V. Karup-Moeller, S., Leonardsen, E. S. and Condliffe, E. (1992): Tuperssuatsiaite, from Aris phonolite, Windhoek, Namibia. Neues Jahrbuch für Mineralogie Monatsh., 1992, 145-152.; Min Rec 36:3 pp275-280; Cámara, F., Garvie, L. A. J., Devouard, B., Groy, T. L. and Buseck, P. R. (2002): The structure of Mn-rich tuperssuatsiaite: A palygorskite-related mineral. Am. Mineral. 87, 1458-1463; []; Rocks & Min. (2007) 82:243-244; Chukanov, N. V.; Britvin, S. N.; Blass, G.; Belakovskiy, D. I.; Van, K. V. (2012): Windhoekite, Ca2Fe3+3-x(Si8O20)(OH)4•10H2O, a new palygorskite-group mineral from the Aris phonolite, Namibia. European Journal of Mineralogy 24, 171-179. [includes analysis of a tuperss.]
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
Takai, Y., Uehara, S., Inoo, T. (2011) Minerals from Khibiny, Kola, Russia. Chigaku Kenkyu, 60 (1), 41-46.; Arzamastsev, A., Yakovenchuk, V., Pakhomovsky, Y., & Ivanyuk, G. (2008). The Khibina and Lovozero alkaline massifs: Geology and unique mineralization. In Guidbook for 33rd International Geological Congress Excursion (No. 47, p. 58).
  • New Mexico
    • Otero Co.
      • Cornudas Mts
Jerry Cone Collection
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