Drip acid is not reactive, certainly not calcite, nor like fluorite, crystal looks a bit like a fish eye stone, all unknown, interested in their own to buy back to study.

Our Mineral crystal Shop at Shantou,Guangdong,China
We can offer all kinds of chinese mineral crystals by wholesale or by retail.You are welcome to contact us in free time!
When in China, please come by for a visit. I would be very happy to meet with you!