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Naujakasite

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Formula:
(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26
System:
Monoclinic
Colour:
Gray to silver-white; ...
Hardness:
2 - 3
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.

Classification of Naujakasite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
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
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Type Occurrence of Naujakasite

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).
Year of Discovery:
1897
Geological Setting of Type Material:
Alkalic intrusion.
Associated Minerals at Type Locality:

Physical Properties of Naujakasite

Pearly
Diaphaneity (Transparency):
Translucent
Comment:
Pearly on {001}
Colour:
Gray to silver-white; colourless in transmitted light.
Hardness (Mohs):
2 - 3
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)

Crystallography of Naujakasite

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

Optical Data of Naujakasite

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 Naujakasite

Formula:
(Na,K)6(Fe2+,Mn2+,Ca)(Al,Fe)4Si8O26
Idealised Formula:
Na6(Fe2+,Mn2+)Al4Si8O26
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Mg,Ca,K,H2O,P

Relationship of Naujakasite to other Species

9.EG.05CymriteBaAl2Si2(O,OH)8 · H2O
9.EG.10ManganonaujakasiteNa6(Mn2+,Fe2+)Al4Si8O26
9.EG.15DmisteinbergiteCaAl2Si2O8
9.EG.20KampfiteBa12(Si11Al5)O31(CO3)8Cl5
9.EG.25SträtlingiteCa2Al2SiO7 · 8H2O
9.EG.25VertumniteCa4Al4Si4O6(OH)24 · 3H2O
9.EG.30Eggletonite(Na,K,Ca)2(Mn,Fe)8(Si,Al)12O29(OH)7 · 11H2O
9.EG.30Ganophyllite(K,Na,Ca)2Mn8(Si,Al)12(O,OH)32 · 8H2O
9.EG.30Tamaite(Ca,K,Ba,Na)3-4Mn24(Si,Al)40(O,OH)112 · 21H2O
9.EG.35CoombsiteK(Mn,Fe,Mg)13(Si,Al)18O42(OH)14
9.EG.35ZussmaniteK(Fe,Mg,Mn)13(Si,Al)18O42(OH)14
9.EG.40Franklinphilite(K,Na)4(Mn,Zn,Mg,Fe)48(Si,Al)72(O,OH)216 · 6H2O
9.EG.40LennilenapeiteK6-7(Mg,Mn,Fe,Zn)48(Si,Al)72(O,OH)216 · 16H2O
9.EG.40Parsettensite(K,Na,Ca)7.5(Mn,Mg)49Si72O168(OH)50 · nH2O
9.EG.40Stilpnomelane(K,Ca,Na)(Fe2+,Mg,Al,Fe3+)8(Si,Al)12(O,OH)36 · nH2O
9.EG.45Latiumite(Ca,K)4(Si,Al)5O11(SO4,CO3)
9.EG.45Tuscanite(K(Ca,Na)6(Si,Al)10O22[SO4,CO3,(OH)2] · H2O
9.EG.50JagoitePb18Fe43+[Si4(Si,Fe3+)6][Pb4Si16(Si,Fe)4]O82Cl6
9.EG.55WickenburgiteCaPb3Al2Si10O24(OH)6
9.EG.60HyttsjöitePb18Ba2Ca5Mn22+Fe23+Si30O90Cl · 6H2O
9.EG.65ArmbrusteriteK5Na7Mn15[(Si9O22)4](OH)10 · 4H2O
9.EG.70Britvinite[Pb7(OH)3F(BO3)2(CO3)][Mg4.5(OH)3(Si5O14)]
9.EG.75BannisteriteCa0.5(K,Na)0.5(Mn,Fe,Zn)10(Si,Al)16O38(OH)8 · 5.5H2O
16.4.1Nepheline(Na,K)AlSiO4
16.4.2Panunzite(K,Na)AlSiO4
16.4.3Trikalsilite(K,Na)AlSiO4
16.4.4Anorthoclase(Na,K)AlSi3O8
16.4.6Montesommaite(K,Na)9Al9Si23O64 · 10H2O

Other Names for Naujakasite

Name in Other Languages:
German:Naujakasit
Spanish:Naujakasita

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 Naujakasite

Reference List:
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 Naujakasite

Specimens:
The following Naujakasite specimens are currently listed for sale on minfind.com.

Localities for Naujakasite

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.
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
        • Kuannersuit Plateau (Kvanefjeld)
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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