The photo below (plane polarized light) shows pumpellyite in a thin vein, a typical occurrence in blueschist metamorphic veins.
Biaxial -; 2V varies from low to very high; moderate interference colors, which may be anomalous; colorless to green, brown, or yellow in plane polarized light; generally in fibrous form. Crossed polarizer (left, above) and plane polarized light views (right, above) show the typical appearance of pumpellyite in thin section.
The photo below (plane polarized light) shows pumpellyite in a thin vein, a typical occurrence in blueschist metamorphic veins.
Pumpellyite is a low temperature metamorphic mineral that commonly occurs with chlorite, albite, prehnite, clinozoisite, etc.
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