Formula :
(K2,Ca,Na2,Mg)2[Al4Si14O36 * 15 H2O
System: hexagonal Hardness:4 Rarity:not common
Strunz id:VIII/J.26-90 -
SILICATES
Name origin: 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.
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