Okay, so this seems like a large price for a Arkansas Quartz Crystal.  However, this one has many special 'things' going on.  I see a record keeper, a rainbow in the base crystal, transmitter, and some very very unusal markings that I have never seen before.  I tried to photograph them which you can see in the above image.  I feel that there are many lessons to be learned with this one.  Again, I really never wanted to sell it, but I am working on going thru the last 25 years of quartz crystals........time for new guardians.  sigh.......size is 3 tall by 2 wide, but seems much larger than that!

Quartz Crystal with Special Markings