Keled Rocks Elite Shungite Stones for Water Purification Bulk Lot, # XL, Elite Shungite

How many stones do you get for this price?

Whats the difference between this selection and your other elite shungite besides the price? Onea 10$ more than the other

How can I test to see if they are authentic?

When tested with a quality multimeter like a Fluke what Ohm range do you get? And what range do you consider to be type 1?