This is a Pair of large Obsidian Pieces, they are both pieces of one large rock that split in two. It did so in our yard, during a hard freeze 2 winters ago. One piece is 20 lbs, 13 oz, the other is 21 lbs 8 ozs. When placed together they stand  9.5" high x 16" wide. This rough mineral raw specimen of Black Obsidian is a beauty, we bought it at an estate sale in Sedona about 5 years ago. It is a natural shape piece originating from the United States. This piece is ideal for collectors or display purposes, showcasing the natural beauty and geological history of the mineral, or for cabbing, if desired.