Portraits of Wildflowers

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Archive for May 3rd, 2014

Crystalline layers

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Crystalline Layer 9856

In the picture two days ago showing geological formations at Caprock Canyons State Park, you may have noticed layers of light-colored rock extending across the sandstone in several places. This lighter-colored rock, of which you see a sample more closely in the picture above, is rather soft, and I noticed broken pieces of it, like those shown below, on the trail in several places when I was there on April 15th. Not knowing what kind of mineral it is, I asked geologist Eric Potter, who determined that it’s gypsum. (Coincidentally, Eric and I are leading a nature walk in Great Hills Park starting at 9 o’clock this morning. If you’re in the area and would like to come along, join us at the playscape on Sierra Oaks.)

Crystalline Rock Shards 9746

© 2014 Steven Schwartzman

Written by Steve Schwartzman

May 3, 2014 at 6:04 AM

Posted in nature photography

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