Black Lava Rock - 2XL 10 lbs Lava Rocks will instantly give any old fireplace an exotic, yet classy look. Naturally occurring, these Lava Rocks are formed as volcanic magma rises to the surface, cools and releases gases which gives these rocks their coarse surface. Because they are volcanic, they can withstand extreme temperatures without sustaining any damage or crumbling. Lava Rocks may be used exclusively in a fireplace or fire pit, or may be used as a base or filler for other ornaments such as fire glass or Light stones. Whichever way they are used, the resulting effect is truly fascinating. The best part is that they require very little maintenance. Features Natural lava stone with a rolled appearance Smooth tumbled finish with round appearance Natural gray and Black in color Specifications Color: Gray Black Size: 2XL Weight: 10 lbs