Obsidian praying hands. Measurements on pics. Weight 2.5oz. Obsidian, igneous rock occurring as a natural glass formed by the rapid cooling of viscous lava from volcanoes. Obsidian is extremely rich in silica (about 65 to 80 percent), is low in water, & has a chemical composition similar to rhyolite. Obsidian has a glassy lustre & is slightly harder than window glass. Obsidian Praying Hands. Guan Yin
