Question: What is the name for the lava, often found with Pele's tears, defined as volcanic glass fibers or thin strands of volcanic glass?
Sentence (from "Volcanic glass"): Volcanic glass can refer to the interstitial, or matrix, material in an aphanitic (fine grained) volcanic rock or can refer to any of several types of vitreous igneous rocks. Most commonly, it refers to obsidian, a rhyolitic glass with high silica content.
Relevant evidence: No