Wednesday, July 23, 2014

Geo 730: July 23, Day 569: Stilbite Vesicles

I'll be mixing in photos from three different trips to Quartzville over the last couple years for this portion of the series; this one is from the middle of June, and shows a bit of vesicular basalt. The gas bubbles are partly filled with (mostly) stilbite. Note that I can't make that identification from this photo; the resolution isn't good enough. You need to get up close and personal with a hand lens to make that call. With the exception of natrolite, that's generally the case at this outcrop. Natrolite comes in larger pieces, has a very distinctive fabric of radiating crystal fibers, and can often be identified from several yards away.

Photo unmodified. June 19, 2014. FlashEarth location.

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