This is simbircite. It is a gemstone formed from ancient ammonite fossils from Simbirsk, Russia. It's a combination of pyrite, aragonite, quartz, and calcite, and it has a beautiful, warm energy. I love the open pyrite chambers and the incredible warmth of the golden calcite. It combines the quality of all of these gemstones, and also brings with it warmth, happiness, and a deeply spiritual energy supporting self-esteem, creativity, and personal growth.