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Propylite

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Name:
The term was first used by Richthofen in 1868.
A low to medium-temperature metasomatic rock, sometimes a granofels or schist, generally formed by the propylitic alteration of basic to intermediate volcanic rocks around hydrothermal ore deposits or by plate magmatic alteration. Low-temperature varieties are principally composed of albite, calcite and chlorite; high-temperature varieties contain more epidote.

A hydrothermally altered rock, often andesite, resembling a greenstone and containing calcite, chlorite, epidote, quartz, and minor pyrite or iron oxides. Propylite is common in mining districts of the Western United States, generally in the outermost subzone of hydrothermal alteration.

See Also: propylitization

Ref: AGI


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Classification of PropyliteHide

Mineralogy of PropyliteHide

Non-essential minerals - these minerals are common, sometimes major components, but are not always present:
Actinolite☐{Ca2}{Mg4.5-2.5Fe0.5-2.5}(Si8O22)(OH)2
CalciteCaCO3
ChloriteA name commonly used for undifferentiated members of the chlorite group.
Epidote{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Feldspar > Alkali Feldspar > AlbiteNa(AlSi3O8)
Mica > BiotiteA series or subgroup of the Mica Group.

References for PropyliteHide

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Fettes (et al.), Metamorphic Rocks - A Classification and Glossary of Terms (2007) Cambridge University Press

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