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Rocks and Minerals seen through the Petrological Microscope

Normal Light

Polarised Light

(Scale: Each image approx. 0.75 mm across)

Pyroxene (Augite). Devil’s Tower, Wyoming
Square Augite encloses small Apatite at its lower left corner. Long crystals of feldspar show some flow alignment.

Augite Crystal and Feldspar from Devil's Tower.