Djonyx2002. Can you provide some background and better photos. For instance, " I found this stone in my backyard in South Carolina near a mine that produces Calcite in a rubble pile. The largest city nearest to the mine is Charleston. Insert any facts about the stone, like it is not magnetic, it floats in water, it is translucent, it is very heavy and so.hard , i can't scratch it with my pocket knife or a piece of quartz. I tested it with some weak acid and it bubbled up on the surface. Then hit the sqare icon that looks like a Photo and follow the prompts to insert a close up photo from your device. The membership will be better able to answer your questions rocks and minerals are difficult to identify even with those facts. We look forward to any input on your specimens.