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Naujakasite

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Formula:
(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26
Colour:
Gray to silver-white; colourless in transmitted light.
Lustre:
Pearly
Hardness:
2 - 3
Specific Gravity:
2.615 - 2.622
Crystal System:
Monoclinic
Name:
After the type locality at Naujakasik (Naajakasik), Ilimaussaq complex, Narsaq, Kitaa (West Greenland) Province, Greenland. First collected by Gustav Flink in 1897, and first described by Bøgghild (1933).
The Fe2+ analogue of Manganonaujakasite.


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Classification of NaujakasiteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.EG.10

9 : SILICATES (Germanates)
E : Phyllosilicates
G : Double nets with 6-membered and larger rings
73.1.1.1

73 : PHYLLOSILICATES Condensed Tetrahedral Sheets
1 : Condensed Tetrahedral Sheets with double layers
16.4.5

16 : Silicates Containing Aluminum and other Metals
4 : Aluminosilicates of Na and K

Physical Properties of NaujakasiteHide

Pearly
Transparency:
Translucent
Comment:
Pearly on {001}
Colour:
Gray to silver-white; colourless in transmitted light.
Hardness:
2 - 3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
Micaceous (perfect) on {001}; on {401} and {010}, distinct.
Density:
2.615 - 2.622 g/cm3 (Measured)    2.661 g/cm3 (Calculated)

Optical Data of NaujakasiteHide

Type:
Biaxial (-)
RI values:
nα = 1.537 nβ = 1.550 nγ = 1.556
2V:
Measured: 52° to 71°, Calculated: 66°
Max Birefringence:
δ = 0.019
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
weak

Chemical Properties of NaujakasiteHide

Formula:
(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26
IMA Formula:
Na6Fe2+Al4Si8O26
Idealised Formula:
Na6(Fe2+,Mn2+)Al4Si8O26
Common Impurities:
Ti,Mg,Ca,K,H2O,P

Crystallography of NaujakasiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Cell Parameters:
a = 15.025 Å, b = 7.991 Å, c = 10.486 Å
β = 113.67°
Ratio:
a:b:c = 1.88 : 1 : 1.312
Unit Cell V:
1,153.08 ų (Calculated from Unit Cell)
Z:
2

Type Occurrence of NaujakasiteHide

General Appearance of Type Material:
Aggregates of pseudo-hexagonal plates.
Place of Conservation of Type Material:
University of Copenhagen, Copenhagen, Denmark (1933.31); U.S. National Museum of Natural History, Washington, D.C., USA (97479).
Geological Setting of Type Material:
Alkalic intrusion.
Associated Minerals at Type Locality:

Other Language Names for NaujakasiteHide

German:Naujakasit
Spanish:Naujakasita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Villiaumite2 photos of Naujakasite associated with Villiaumite on mindat.org.
Aegirine1 photo of Naujakasite associated with Aegirine on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.EG.05CymriteBaAl2Si2(O,OH)8 · H2OMon.
9.EG.10ManganonaujakasiteNa6(Mn2+,Fe2+)Al4Si8O26Mon.
9.EG.15DmisteinbergiteCa(Al2Si2O8)Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
9.EG.20KampfiteBa12(Si11Al5)O31(CO3)8Cl5Mon. m
9.EG.25SträtlingiteCa2Al2SiO7 · 8H2OTrig.
9.EG.25VertumniteCa4Al4Si4O6(OH)24 · 3H2OMon. 2/m : P21/m
9.EG.30Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2OMon.
9.EG.30Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2OMon.
9.EG.30Tamaite(Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2OMon.
9.EG.35CoombsiteK(Mn,Fe,Mg)13(Si,Al)18O42(OH)14Trig.
9.EG.35ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14Trig. 3 : R3
9.EG.40Franklinphilite(K,Na)4(Mn2+,Mg,Zn)48(Si,Al)72(O,OH)216 · 6H2OTric.
9.EG.40LennilenapeiteK6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2OTric.
9.EG.40Parsettensite(K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2OMon. 2/m : B2/m
9.EG.40Stilpnomelane(K,Ca,Na)(Fe,Mg,Al)8(Si,Al)12(O,OH)36 · nH2OTric. 1 : P1
9.EG.45Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)Mon.
9.EG.45Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2OMon.
9.EG.50JagoitePb18Fe3+4[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6Hex.
9.EG.55WickenburgiteCaPb3Al2Si10O24(OH)6Trig. 3m : P3 1c
9.EG.60HyttsjöitePb18Ba2Ca5Mn2+2Fe3+2Si30O90Cl · 6H2OTrig.
9.EG.65ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2OMon. 2/m : B2/m
9.EG.70Britvinite[Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)]Tric. 1 : P1
9.EG.75Bannisterite(Ca,K,Na)(Mn2+,Fe2+)10(Si,Al)16O38(OH)8 · nH2OMon. 2/m : B2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.4.1Nepheline(Na,K)AlSiO4Hex. 6 : P63
16.4.2Panunzite(K,Na)AlSiO4Hex. 6 : P63
16.4.3Trikalsilite(K,Na)AlSiO4Hex.
16.4.4Anorthoclase(Na,K)AlSi3O8Tric.
16.4.6Montesommaite(K,Na)9Al9Si23O64 · 10H2OOrth.

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 NaujakasiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Bøggild, O.B. (1933): Igalikite and naujakasite, two new minerals from South Greenland. Meddelelser om Grønland. 92 (9), 1-12 .
American Mineralogist(1935): 20: 138 (abstract).
Peterson, O.V. (1967) The mineralogy of naujakasite. Medd. Grønland, 181(6), 1-18.
American Mineralogist (1968): 53: 1780.
Basso, R., A. Dal Negro, A. Della Guista, and L. Ungaretti (1975) The crystal structure of naujakasite.
Geological Survey of Greenland, Report 116: 11-24.
Petersen, O.V. and S. Andersen (1975) The crystal habit of naujakasite. Geological Survey of Greenland, Report 116: 5-9.
Chemical Abstracts (1976): 84: 129188 (abstract).
Khalilov, A.D., N.K. Dzhafarov, and K.S. Mamedov (1977) Crystal structure of naujakasite - Na6{Fe2+[(Si;Al)8Si4O26]}: Dokl. Acad. Nauk Az. SSR, 33(7), 35{40 (in Russian).
Chemical Abstracts (1978): 88: 113658 (abstract).
Andersen, T. and H. Sørensen (2005) Stability of naujakasite in hyperagpaitic melts, and the petrology of naujakasite lujavrite in the Ilímaussaq alkaline complex, South Greenland. Mineralogical Magazine; April 2005; v. 69; no. 2; p. 125-136.

Internet Links for NaujakasiteHide

Localities for NaujakasiteHide

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
Petersen, O.V. (2001): List of all minerals identified in the Ilímaussaq alkaline complex, South Greenland. Geology of Greenland Survey Bulletin. 190, 25-33; Andersen, T., & Friis, H. (2015). The transition from agpaitic to hyperagpaitic magmatic crystallization in the Ilímaussaq alkaline complex, South Greenland. Journal of Petrology, 56(7), 1343-1364.
Chukanov, N.V. (2014): Infrared spectra of mineral species. Extended library. Springer, Dordrecht 2014, p. 442
Grey, I.E., Macrae, C.M., Mumme, W.G. and Pring, A. (2010): Townendite, Na8ZrSi6O18, a new uranium-bearing lovozerite group mineral from the Ilímaussaq alkaline complex, Southern Greenland. American Mineralogist 95, 646-650.
- Petersen, O., Khomyakov, A., Soerensen, H. (2001): Natrophosphate from the Ilimaussaq alkaline complex South Greenland, South Greenland, Geology of Greenland Survey Bulletin, 190, 139-141
O.T.Ljøstad specimen & photo
Metcalf-Johansen, J. (1977): Willemite from the Ilimaussaq alkaline Intrusion. Mineralogical Magazine. 41, 71-75
        • Tunulliarfik Fjord (Tunugdliarfik)
Knut Edvard Larsen collection # 1135
Bøggild, O.B. (1933) Igalikite and naujakasite, two new minerals from South Greenland. Medd. Grønland, 92(9), 1-12.
Danø, M., Sørensen, H. (1959): An examination of the rare minerals from the Nepheline Syenites of south west Greenland. Meddelelser om Grønland. 162, Nr.5, Reitzels Forlag, København
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