Volcanic Glass
Isotropic
Vesicular
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Description

Transparent colorless to pale gray, green, or brown. Nonpleochroic. Isotropy is diagnostic feature, although devitrification may cause low-order birefringence at edges of grains. Moderate relief. May have bubble or pipe vesicles, stretching textures, cuspate to lunate bubble wall shards with sharp edges. May be disseminated throughout other sediment or occur in pure layers. Tephra may also contain crystalline grains from the same eruption or reworked material.
Imposters

CSD Facility

116 Church Street NE, Minneapolis, MN 55455

P: 612-626-7889