You are getting 1 random piece of a 25 gram stone

This unique and captivating item is a rare Black Hag Hex Stone.
 also known as a Adder or the Holey Stone or Hex Stone.
 It naturally formed, making it a one-of-a-kind piece that is perfect for collectors of unusual rocks, fossils, and minerals.
The black Hag Hex stone was made by the Great Piddock clam thousands of years ago from black peat moss near rivers entering the ocean
The black peat fossilized with the natural holes and indentations made by the Great Piddock clam and broke away and was tumbled over many thousands of years .
This Black Hag Hex Adder stone has no natural hole through it.
 With its fascinating appearance and mysterious origins
 This Stone is a must-have for any collector or enthusiast. It is ideal for display or as an addition to a larger collection of rocks, fossils, and minerals.
It is also known as Black Angel Wings in some areas
 Don't miss out on the chance to own this captivating piece of nature's art.

How it was formed :
 many thousands of years ago saltwater marsh peat that had regularly accumulated new layers of silt and organic matter, which created the “growth rings” appearance .
A Great Piddock colony had taken up residency and bored holes into the peat when it was still soft.
 Changes in sea levels and many years of accumulated silt and organic matter compressed and buried the  black sample deep enough that sunlight and oxygen no longer reached it. 
The anerobic environment fossilized and turned the sample various shades of black, and the Great Piddocks died or moved on.

I have applied a clear coat to bring out there natural beauty. 
They are also easily drilled out to transform into a pendant necklace