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Eirikite

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Eric the Red (Eiríkur rauði)
Formula:
KNa6Be2(Si15Al3)O39F2
Colour:
White to colorless
Lustre:
Vitreous, Silky
Hardness:
6
Specific Gravity:
2.59
Crystal System:
Trigonal
Member of:
Name:
Named after Eirik Raude (950-1003), discoverer of Greenland and father of Leiv (Leif) Eiriksson, after whom leifite is named.
Leifite Group.
The K analogue of leifite and telyushenkoite.


Classification of Eirikite

Approved
Approval Year:
2007
9.EH.25

9 : SILICATES (Germanates)
E : Phyllosilicates
H : Transitional structures between phyllosilicate and other silicate units
76.2.11.3

76 : TECTOSILICATES Al-Si Framework
2 : Al-Si Framework Feldspathoids and related species

Physical Properties of Eirikite

Vitreous, Silky
Colour:
White to colorless
Streak:
White
Hardness:
Tenacity:
Brittle
Cleavage:
Distinct/Good
{1010}
Fracture:
Irregular/Uneven, Conchoidal
Density:
2.59(1) g/cm3 (Measured)    2.577 g/cm3 (Calculated)

Optical Data of Eirikite

Type:
Uniaxial (+)
RI values:
nω = 1.517() nε = 1.521(1)
Max Birefringence:
δ = 0.004
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemical Properties of Eirikite

Formula:
KNa6Be2(Si15Al3)O39F2

Crystallography of Eirikite

Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
P3m1
Setting:
P3m1
Cell Parameters:
a = 14.3865(9) Å, c = 4.8733(4) Å
Ratio:
a:c = 1 : 0.339
Unit Cell V:
873.50 ų (Calculated from Unit Cell)
Z:
1

X-Ray Powder Diffraction

Powder Diffraction Data:
d-spacingIntensity
4.710 (29)
4.153 (21)
3.386 (70)
3.161 (100)
3.115 (17)
2.466 (31)
2.398 (19)
2.217 (20)

Type Occurrence of Eirikite

General Appearance of Type Material:
finely or coarsely fibrous, monomineralic aggregates up to several centimetres across
Place of Conservation of Type Material:
Department of Geology, Natural History Museum, University of Oslo (catalogue no. 41773).
Geological Setting of Type Material:
A nepheline-syenite pegmatite
Associated Minerals at Type Locality:

Synonyms of Eirikite

Other Language Names for Eirikite

Relationship of Eirikite to other Species

Member of:
Other Members of this group:
Leifite(Na,H2O)Na6[Be2Al2(Al,Si)Si15O39]F2
Telyushenkoite(Cs,Na,K)Na6[F2|Be2Al3Si15O39]

Common Associates

Associated Minerals Based on Photo Data:
Leifite2 photos of Eirikite associated with Leifite on mindat.org.
Microcline2 photos of Eirikite associated with Microcline on mindat.org.
Natrolite1 photo of Eirikite associated with Natrolite on mindat.org.
Aegirine1 photo of Eirikite associated with Aegirine on mindat.org.
Rhodochrosite1 photo of Eirikite associated with Rhodochrosite on mindat.org.
Gaidonnayite1 photo of Eirikite associated with Gaidonnayite on mindat.org.

Related Minerals - Nickel-Strunz Grouping

9.EH.05ManganoneptuniteNa2KLiMn2+2Ti2Si8O24
9.EH.05NeptuniteNa2KLiFe2+2Ti2Si8O24
9.EH.05WatatsumiiteNa2KLi(Mn2+,Fe2+)2V4+2[Si8O24]
9.EH.05MagnesioneptuniteKNa2Li(Mg,Fe)2Ti2Si8O24
9.EH.10GrumantiteNa(HSi2O5) · H2O
9.EH.15SarcoliteNa4Ca12Al8Si12O46(SiO4,PO4)(OH,H2O)4(CO3,Cl)
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.30NafertisiteNa3Fe2+10Ti2(Si6O17)2O2(OH)6F(H2O)2

Fluorescence of Eirikite

Other Information

Notes:
insoluble in warm 6 M HCl, melts relatively easily using a gas torch, leaving a white, vesicular globule
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 Eirikite

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Larsen, A.O., Kolitsch, U., Gault, R.A., Giester, G. (2010): Eirikite, a new mineral species of the leifite group from the Langesundsfjord district, Norway. European Journal of Mineralogy, 22, 875-880.
Armstrong, J.A., Friis, H., Lieb, A., Finch, A.A., Weller, M.T. (2010): Combined single-crystal X-ray and neutron powder diffraction structure analysis exemplified through full structure determinations of framework and layer beryllate minerals. American Mineralogist, 95, 519-526. [refinement of Na-bearing leifite]
Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 pp [p 112-113]
HORVÁTH, L. (2009) Bertrandite, eirikite and a review of beryllium minerals from Mont Saint-Hilaire. MICRONEWS, 43(5), 9-12.

Internet Links for Eirikite

mindat.org URL:
https://www.mindat.org/min-36060.html
Please feel free to link to this page.

Localities for Eirikite

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.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
LARSEN, A.O., KOLITSCH, U., GAULT, R.A. and GIESTER,G. (2010) Eirikite, a new mineral species of the leifite group from the Langesundsfjord district, Norway. European Journal of Mineralogy, 22, 875-880. Can. Museum of Nature & Horváth collections;
HORVÁTH, L. (2009) Bertrandite, eirikite and a review of beryllium minerals from Mont Saint-Hilaire. MICRONEWS, 43(5), 9-12.
Norway (TL)
 
  • Vestfold
    • Larvik
      • Langesundsfjorden
        • Vesle Arøya
Larsen, A. O. (ed.) (2010): The Langesundsfjord. History, geology, pegmatites, minerals. Bode Verlag Gmbh, Salzhemmendorf, Germany, 240 p: Larsen, A.O., Kolitsch, U., Gault, R.A. & Giester, G. (2010): Eirikite a new mineral species of the leifite group from the Langesundsfjord district, Norway. European Journal of Mineralogy. 22, 875–880
Russia
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Lovozero Massif
          • Alluaiv Mt
            • Umbozero mine (Umbozerskii mine; Umba Mine)
Pavel M. Kartashov data
Mineral and/or Locality  
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