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Erionite-Na

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Formula:
Na10(Si26Al10O72) · 30H2O
System:
Hexagonal
Colour:
White
Lustre:
Vitreous
Hardness:
3½ - 4
Name:
Named in 1898 by Arthur Starr Eakle from the Greek εριον meaning wool in allusion to the "wooly" appearance of the type material. Erionite was first found at the Durkee Fire Opal Mine, Swayze Creek, Durkee, Baker Co., Oregon (Tschernich, 1992). In modern nomenclature, the original erionite was erionite-Na, but potassium was nearly equal to sodium. Levinson Rule suffix added in allusion to Na dominant excangable cations.
Isostructural with:
A zeolite difficult to distinguish from offrétite.


Classification of Erionite-Na

Approved, 'Grandfathered' (first described prior to 1959)
Approval Year:
1998
9.GD.20

9 : SILICATES (Germanates)
G : Tektosilicates with zeolitic H2O; zeolite family
D : Chains of 6-membered rings – tabular zeolites

Physical Properties of Erionite-Na

Vitreous
Colour:
White
Streak:
White
Hardness (Mohs):
3½ - 4

Optical Data of Erionite-Na

Type:
Uniaxial (+)
RI values:
nω = 1.471 nε = 1.474
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Erionite-Na

IMA Formula:
Na10(Si26Al10O72) · 30H2O
Elements listed in formula:

Crystallography of Erionite-Na

Crystal System:
Hexagonal
Class (H-M):
6/mmm (6/m 2/m 2/m) - Dihexagonal Dipyramidal
Space Group:
P63/mmc
Cell Parameters:
a = 13.15 Å, c = 15.05 Å
Ratio:
a:c = 1 : 1.144
Unit Cell Volume:
V 2,253.82 ų (Calculated from Unit Cell)

Type Occurrence of Erionite-Na

Relationship of Erionite-Na to other Species

Other Members of Group:
Erionite-Ca(Ca,K2,Na2)2[Al4Si14O36] · 15H2O
Erionite-K(K2,Ca,Na2)2[Al4Si14O36] · 15H2O
9.GD.05Gmelinite-CaCa2(Si8Al4)O24 · 11H2O
9.GD.05Gmelinite-KK4(Si8Al4)O24 · 11H2O
9.GD.05Gmelinite-NaNa4(Si8Al4)O24 · 11H2O
9.GD.10WillhendersoniteKCa(Si3Al3)O12 · 5H2O
9.GD.10Chabazite-CaCa2Al4Si8O24 · 13H2O
9.GD.10Chabazite-K(K2NaCa0.5)Al4Si8O24 · 11H2O
9.GD.10Chabazite-Na(Na3K)Al4Si8O24 · 11H2O
9.GD.10Chabazite-Sr(Sr,Ca)2Al4Si8O24 · 11H2O
9.GD.10Chabazite-Mg(Mg0.7K0.5Ca0.5Na0.1)Al3Si9O24 · 10H2O
9.GD.15Lévyne-CaCa3(Si12Al6)O36 · 18H2O
9.GD.15Lévyne-NaNa6(Si12Al6)O36 · 18H2O
9.GD.20Bellbergite(K,Ba,Sr)2Sr2Ca2(Ca,Na)4(Si,Al)36O72 · 30H2O
9.GD.20Erionite-CaCa5(Si26Al10O72) · 30H2O
9.GD.20Erionite-KK10(Si26Al10O72) · 30H2O
9.GD.25OffretiteKCaMg(Si13Al5)O36 · 15H2O
9.GD.25WenkiteBa4Ca6(Si,Al)20O41(OH)2(SO4)3 · H2O
9.GD.30Faujasite-Ca(Ca,Na,Mg)2(Si,Al)12O24 · 15H2O
9.GD.30Faujasite-Mg(Mg,Na,K,Ca)2(Si,Al)12O24 · 15H2O
9.GD.30Faujasite-Na(Na,Ca,Mg)2(Si,Al)12O24 · 15H2O
9.GD.35MaricopaiteCa2Pb7(Si36Al12)O99 · n(H2O,OH)
9.GD.35Mordenite(Na2,Ca,K2)4(Al8Si40)O96 · 28H2O
9.GD.40Dachiardite-CaCa2(Si20Al4)O48 · 13H2O
9.GD.40Dachiardite-NaNa4(Si20Al4)O48 · 13H2O
9.GD.45EpistilbiteCa3(Si18Al6)O48 · 16H2O
9.GD.50Ferrierite-K(K,Na)5(Si31Al5)O72 · 18H2O
9.GD.50Ferrierite-Mg[Mg2(K,Na)2Ca0.5](Si29Al7)O72 · 18H2O
9.GD.50Ferrierite-Na(Na,K)5(Si31Al5)O72 · 18H2O
9.GD.55BikitaiteLiAlSi2O6 · H2O

Other Names for Erionite-Na

Name in Other Languages:

Other Information

Health Risks:
Carcinogenic upon inhalation of its dust, due to its fibrous structure (Ref.: IARC Monography 42:225-239, 1987)

References for Erionite-Na

Reference List:
Sheppard, R.A. and Gude, A.J. (1969b) Chemical composition and physical properties of the related zeolites offretite and erionite. American Mineralogist: 54: 875-886.

Gualtieri, A., G. Artioli, E. Passaglia, S. Bigi, A. Viani, and J.C. Hanson (1998): Crystal structure-crystal chemistry relationships in the zeolites erionite and offretite American Mineralogist: 83, 590-606.

Passaglia, E., G. Artioli, and A. Gualtieri (1998): Crystal chemistry of the zeolites erionite and offretite American Mineralogis: 83, 577-589.

European Journal of Mineralogy: 10 (1998), 1037.

Internet Links for Erionite-Na

mindat.org URL:
https://www.mindat.org/min-6917.html
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Localities for Erionite-Na

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.
Antarctica
 
  • Eastern Antarctica
    • Terra Nova Bay
Dogan,Umran and Dogan,Meral (2008) Re-evaluation and re-classification of erionite series minerals:Environ Geochem Health 30:355-366
    • Victoria Land
Dogan,Umran and Dogan,Meral (2008) Re-evaluation and re-classification of erionite series minerals:Environ Geochem Health 30:355-366
Australia
 
  • Victoria
    • Bass Coast Shire
Birch, W.D. (1989) Zeolites of Victoria. Mineralogical Society of Victoria - Special Publication No.2 (110 pages).
    • Flinders area
Dogan,Umran and Dogan,Meral (2008) Re-evaluation and re-classification of erionite series minerals,Environ Geochem Health 30:355-366
Italy
 
  • Veneto
    • Vicenza Province
      • Montecchio Maggiore
        • San Pietro
Passaglia E., Artioli G., Gualtieri A. - Crystal chemistry of zeolites erionite and offretite. Amer. Mineral. (1998), Vol. 83, pp. 577-589.
Japan
 
  • Kyushu Region
    • Nagasaki Prefecture
      • Iki Island
SHIMAZU, M., & MIZOTA, T. (1972). Levyne and erionite from Chojabaru, Iki Island, Nagasaki Prefecture, Japan. The Journal of the Japanese Association of Mineralogists, Petrologists and Economic Geologists, 67(12), 418-424.
Tanzania
 
  • Arusha Region
Dogan,Umran and Dogan,Meral(2008) Re-evaluation and re-classification of erionite series minerals,Environ Geochem Health 30:355-366
Turkey
 
  • Central Anatolia Region
    • Nevşehir Province
Dogan,Umran and Dogan,Meral (2008) Re-evaluation and re-classification of erionite series minerals,Environ Geochem Health 30:355-366
UK
 
  • Northern Ireland
    • Co. Antrim
      • Giant's Causeway
Passaglia E., Artioli G. and Gualtieri A. (1998): Crystal chemistry of the zeolites erionite and offretite. American Mineralogist 83, 577-589; Jaroslaw Skupiewski.RRUFF database-specimen I.D R061126
USA (TL)
 
  • California
    • San Bernardino Co.
Am.Min. 83 (1998), 577
  • North Dakota
    • Dunn Co.
USGS Open File report 10-1286
  • Oregon
    • Baker Co.
      • Durkee
A. Eakle (1898)
    • Malheur Co.
Dogan,Umran and Dogan,Meral (2008) Re-evaluation and re-classification of erionite series minerals, Environ Geochem Health 30:355-366
Mineral and/or Locality  
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