Resistance Of Natural Glass

Natural glass is a well-known phenomena found in different geological formations on both the earth and the lunar surface. This demonstrates that the vitreous state has been resistant to change on the surfaces for more than a hundred million years. Glass formation is determined by magnetic, metamorphic and sedimentary processes. The quantities of naturally produced glass vary between 10-6 and 10-9g, and the occurrence is given in microscopic glassy inclusions as well as in "glassy mountains". The chemical composition is mainly rhyolitic and peraluminous. Natural glass has been under consideration for use as a suitable material for isolating complex and dangerous wastes.