Pelitic Schist
Sante Fe County, New Mexico

The large purple blob is garnet, a mineral common in metamorphosed shaly rocks known as pelitic schists. As garnets nucleate and grow, they can trap nearby grains. These inclusions commonly result in quite striking patterns. This particular garnet trapped a number of quartz crystals in smoothly curving spiral trails. The spiral configuration suggests that the garnet may have rotated as it grew.

Crossed polarizers with gypsum plate

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