What is the name for the lava, often found with Pele's tears, defined as volcanic glass fibers or thin strands of volcanic glass?
Pele's tears Pele’s tears is a geological term for small pieces of solidified lava drops formed when airborne particles of molten material fuse into tearlike drops of volcanic glass. Pele’s tears are jet black in color and are often found on one end of a strand of Pele's hair. Pele's tears is primarily a scientific term used by volcanologists.
Tuff Tuff (from the Italian "tufo") is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption. Following ejection and deposition, the ash is compacted into a solid rock in a process called consolidation. Tuff is sometimes called tufa, particularly when used as construction material, although "tufa" also refers to a quite different rock. Rock that contains greater than 50% tuff is considered tuffaceous.