Dims: 2.6x2.4x1.2" (6.5x6.0x3.0cm)
Wt: 3.8 oz. (107g)
This chunk of sandstone from southern Australia has one surface coated with a thin layer of excellent opal. While very thin (less than 1mm), it shows excellent color, reflecting all of the colors of the rainbow. Each of the areas of opal tends to have a small range of colors, mostly green, yellow, and orange, but there are some small areas of deep red, purple, and blue.