Dims: 2.1" x 1.6" x 1.4" (5.3 x 4.1 x 3.6 cm)
Wt: 2.31 oz. (65.5 g)
This odd specimen consists of a crust of reniform Opal that partly coats one face of a formless host rock that looks like it is made of lava. It is of a variety called Hyalite that is commonly colorless and transparent. There is some noticeable damage to the crust, as part of it is missing. The Hyalite has wonderful, rounded formations (see the close-up image), is exceptionally clear, and has a bright vitreous luster. There are a few cracks running through the crust, but these likely occurred prior to the specimen's mining, as they have small amounts of rust trapped within. The host rock has a pale brown color due to weathering on its originally exposed surfaces, but fresh breakage underneath shows a black color, a dull luster, and a very porous nature.