Obsidian can be an earth-stone, activating the foundation chakra and grounding you in the relationship into the Earth. It clears the aura of unfavorable Vitality, and can even be useful for scrying. Tiger Iron is blend of Tiger Eye, Crimson Jasper, and Hematite, which makes it a powerful grounding stone. https://gemstones-names29629.blogsumer.com/30013347/detailed-notes-on-gemstones-south-africa