Obsidian can be an earth-stone, activating the basis chakra and grounding you in the link into the Earth. It clears the aura of damaging energy, and can be useful for scrying. While not exclusively committed to crystals, this store provides an incredible range of minerals, rocks and fossils from Africa https://simonnjfbx.blogprodesign.com/52511674/gemstones-list-fundamentals-explained