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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.|
|Erionite-Ca, Erionite-K, Erionite-Na|
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
|Dana 8th edition ID:||188.8.131.52|
77 : TECTOSILICATES Zeolites
1 : Zeolite group - True zeolites
|Hey's CIM Ref.:||16.10.25|
16 : Silicates Containing Aluminum and other Metals
10 : Aluminosilicates of Ca and alkalis
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Physical Properties of Erionite
|Diaphaneity (Transparency):||Transparent, Translucent|
|Hardness (Mohs):||3½ - 4|
Optical Data of Erionite
|RI values:||nω = 1.458 - 1.468 nε = 1.458 - 1.480|
|Maximum Birefringence:||δ = 0.000|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Relationship of Erionite to other Species
|Related Minerals - Hey's Index Grouping:|
Other Names for Erionite
|Health Warning:||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
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
The 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.