Altered Feldspar look-alikes
Feldspar (likely K-feldspar) with secondary alteration/mineralization (e.g., chlorite or epidote)
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Open the appSeveral rocks and minerals can be confused with Altered Feldspar. Below are documented look-alikes and the features that tell them apart. Never rely on a single feature. Always check multiple properties.
Similar rocks to compare
Fresh Feldspar
KAlSi3O8 (K-feldspar), NaAlSi3O8 - CaAl2Si2O8 (Plagioclase)
Also known as: Orthoclase, Microcline, Albite, Anorthite
Sericite Schist
Predominantly fine-grained muscovite (sericite) with quartz and other accessory minerals
Also known as: Muscovite Schist
Propylitic Alteration
Assemblage of chlorite, epidote, calcite, and pyrite, often affecting mafic minerals and plagioclase
Also known as: Chlorite-Epidote-Carbonate Alteration
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