Zeolites: Mordenite
Diagnostic Card.
(Ca K 2 Na 2) (Al Si 5 O 12)2 * 6 H 2 O
Crystal system orthorhombic
4.5 Hardness
Specific gravity 2.1
Cleavage is perfect
The break in the wrong
Color colorless or light gray
Color white powder
Gloss glass
This mineral usually crystallizes as prisms acicular or fibrous shape, forming rosettes painted in bright red color due to impurities hematite; It occurs in the form of colorless or light gray, dense masses of porcelain.
Diagnostic features.
It does not dissolve in hydrochloric acid and easily melts in the flame of a candle.
Origin.
As a secondary mineral mordenite occur in the tonsils and fissures of igneous rocks. Sometimes it is observed in some sedimentary rocks.
Place of Birth.
Mordenite was first discovered in the basalts Morden (Nova Scotia, Canada), which is its name. He also noted in Tintik (Utah, USA), Eyros on the Isle of Mull in Scotland, andesites Chollis in Idaho, in the sandy deposits in the Urals and melaphyre Valle dei Tsukanti Vicentino in the province (Italy).
Mordenite in calcite. Cool, m-tion, p. Gonchakov b n p. Lower. Tunguska, Wed. Siberia, Russia. Mordenite (spherulites in chalcedony).
Mordenite. Cool, m-tion, p. Gonchakov b n p. Lower. Tunguska, Wed. Siberia, Russia. Photo: © AA Evseev.
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