Obsidian is an earth-stone, activating the root chakra and grounding you with your link into the Earth. It clears the aura of unfavorable Strength, and can even be utilized for scrying. In pretty uncommon circumstances tourmaline is found in blue color, most well known getting Paraiba tourmaline and indicolite tourmaline. https://gemstone-beads-bracelet29630.blogs100.com/31021423/detailed-notes-on-gemstones-south-africa