Not sure what mineral it is. It looks like Smithsonite. But the possibility of Calcite coming out of the granite pegmatite is bigger. Anyway, the price is not expensive. If you are interested in it, buy it and study it yourself.

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!