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|Colour:||White||Hardness:||3½ - 4|
|Name:||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:||126.96.36.199|
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
|Member of:||Zeolite Group|
|Other Members of Group:|
|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.