Obsidian Rock – Meaning, Uses, Facts, Properties & Color

We know three main classes of rocks, sedimentary, igneous, and metamorphic. In the Limestone article, we learned how sedimentation occurs and the formation of sedimentary rocks takes place. Today, we are going to know Obsidian rock, which falls in the main class of igneous rocks. https://worldofstonesusa.com/blogs/all/obsidian-rock