This material is a result of volcanic glass (obsidian) being spewed into the air and cooling into the round, rough shape we identify as Obsidian Tumbles or Apache Tears.
The legend of Apache Tears a "story of 75 brave Apache warriors who were camped on a mountain and were attacked by soldiers of the U.S. Cavalry. In the sneak attack, 50 of the Apaches were killed within minutes, while those that remained retreated to the edge of a cliff. Realizing that they had nowhere to go, the remaining warriors chose to leap to their death, rather than to die at the hands of the white man.
When the women and children discovered their beloved husbands, fathers, and sons dead at the bottom of the cliff, they began to weep. And as their tears fell, black stones were formed on the white, sandy earth for every tear that hit the ground. These are Apache Tears.
Legend has it that anyone who has any of the stones, the Apache Tears, should never need to cry again...because the Apache women cried enough tears for all who mourn. Some believe that the stones themselves carry spiritual and healing powers."