I got a packet of seeds from Ebay labeled Lithop seeds. I planted them in a covered container in cactus soil after storing them a year in my fridge, and within 3 days they germinated! They seemed to do poorly covered and better with no cover, which makes me wonder if they are even a cacti or succulent as the seedlings need high moisture. The seeds are tiny, brown, with papery sides. And clue to i.d.?