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Erionite

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Colour:
White
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.
This name now refers to a group of related minerals. Erionite minerals have the average chemical formula Ca3K2Na2[Al10Si26O72].30H2O (Z = 1), whereas the closely related offrétite has the average chemical formula CaKMg[Al5Si13O36].16H2O (Z = 1).

NOTE: The zeolite mineral species epitaxially overgrown on lévyne in all cases is identified as erionite (Passaglia et al., 1998).

Health warning: Carcinogenic upon inhalation of its dust, due to its fibrous structure (IARC Monography 42: 225-239, 1987). The population of Cappadocia, Turkey, who live in houses built from erionite-bearing tuff, is reported to suffer from mesothelioma (see also http://en.wikipedia.org/wiki/Erionite ).

Classification of Erionite

77.1.2.5

77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
16.10.25

16 : Silicates Containing Aluminum and other Metals
10 : Aluminosilicates of Ca and alkalis
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Physical Properties of Erionite

Silky
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
White
Streak:
White
Hardness (Mohs):
3½ - 4
Tenacity:
Flexible

Optical Data of Erionite

Type:
Uniaxial (+)
RI values:
nω = 1.458 - 1.468 nε = 1.458 - 1.480
Max Birefringence:
δ = 0.000
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Relationship of Erionite to other Species

16.10.1Bytownite(Ca,Na)[Al(Al,Si)Si2O8]
16.10.2LisetiteCaNa2Al4Si4O16
16.10.4Thomsonite-CaNaCa2[Al5Si5O20] · 6H2O
16.10.5Gonnardite(Na,Ca)2(Si,Al)5O10 · 3H2O
16.10.6MesoliteNa2Ca2Si9Al6O30 · 8H2O
16.10.7Faujasite
16.10.8GarroniteNa2Ca5Al12Si20O64 · 27H2O
16.10.9BoggsiteCa8Na3(Si,Al)96O192 · 70H2O
16.10.10Herschelite
16.10.11Phillipsite
16.10.12Fedorite(Na,K)2-3(Ca4Na3)Si16O38(OH,F)2 · 3.5H2O
16.10.13WillhendersoniteKCa[Al3Si3O12] · 5H2O
16.10.14Barrerite(Na,K,Ca0.5)2[Al2Si7O18] · 7H2O
16.10.15Mordenite(Na2,Ca,K2)Al2Si10O24 · 7H2O
16.10.16Reyerite(Na,K)2Ca14(Si,Al)24O58(OH)8 · 6H2O
16.10.17Lévyne
16.10.18Clinoptilolite
16.10.19Heulandite
16.10.20GobbinsiteNa4(Ca,Mg,K2)Al6Si10O32 · 12H2O
16.10.21Stilbite
16.10.22Dachiardite
16.10.23OffretiteKCaMg(Si13Al5)O36 · 15H2O
16.10.24PerlialiteK9Na(Ca,Sr)[Al2Si4O12]6 · 15H2O
16.10.26Paulingite
16.10.27Sodium Dachiardite(Na2,Ca,K2)4-5Al8Si40O96 · 26H2O
16.10.28Mazzite-Mg(Mg,K,Ca)5(Si26Al10)O72 · 28H2O
16.10.29RoggianiteCa2Be(OH)2Al2Si4O13 · 2.5H2O

Other Names for Erionite

Name in Other Languages:
German:Erionit
Simplified Chinese:毛沸石
Spanish:Erionita
Traditional Chinese:毛沸石

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 Erionite

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.

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

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

Internet Links for Erionite

Localities for Erionite

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.
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