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Rocks and Minerals seen through the Petrological Microscope

Normal Light

Polarised Light

(Scale: Each image approx. 0.75 mm across)

Ostracods. Wamsutter, Wyoming.
These microfossils are surrounded by Calcite crystals but filled with Quartz crystals, clearly seen under Polarised light.

Ostracod Microfossil with Quartz infill.