This is a black obsidian Coffin dish; I have 2 available!
The first one measures 5.1" tall x 3.25" wide at the widest x .75" deep and weighs 246 grams.
The Second one measures 5.08" tall x 3.19" wide at the widest x .91" deep and weighs 300 grams
Polished smooth, this is an opaque black obsidian and is not clear at all.
Beautiful unique find, there are only 2 I could find!