found this rock during one of my craft market crawl and love the natural colors on it. Boulder opals are mined in isolated regions in Queensland.
It consists of Opal occuring naturally in dark ironstone (the host rock). The Opal generally occurs
as thin, wavy veins naturally on the ironstone.
Some ironstone may be visible in the surface of the Boulder Opal when cut.
Some of the inexpensive rocks i collected from the market crawl, the thin veins can only visibly be seen from different light reflections angle. They looked very mystical when you see the bluish purplish hue....
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