Helenite is a gemstone that resulted from volcanic ash and rocks, and is also referred to as emerald obsidianite, Mount St. Helen obsidian. The volcano erupted on May 18, 1980, and ejected igneous rock from 10-20 miles underground. The fury of the volcanic eruption is a wondrous occurrence in nature. The beauty that has been created from itHeleniteis a fantastic thing to hold. Helenite is made by fusing this material at 2700° F, which we facet and polish. The composition of Helenite includes Si-60.50%, Al-16.60%, Fe-6.02%, Ca-5.36%, and other elements. About Us: We are a family-owned and operated business based in San Francisco. Since 1979, Twan Kee Jewelry Manufacturing has specialized in creating quality fine and silver jewelry sold throughout the United States. We specialize in orders of both fine and silver jewelry for wholesale and purchases. We attend jewelry trade shows across the nation. Our store is located at 914 Grant Ave, San Francisco, CA 94108.