20.0 Pumiceous porhyritic rhyolite. Chimaltenango region, Guatemala. Clear glass fibers, gray quartz phenocrysts, and minor black biotite phenocrysts constitute this vesicular rock.

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20.0 Pumiceous porhyritic rhyolite. Chimaltenango region, Guatemala. Clear glass fibers, gray quartz phenocrysts, and minor black biotite phenocrysts constitute this vesicular rock.

20.0 Pumiceous porhyritic rhyolite. Chimaltenango region, Guatemala. Clear glass fibers, gray quartz phenocrysts, and minor black biotite phenocrysts constitute this vesicular rock.

Image 41 of 156

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