About Australian Boulder Opal from GemSelectSee Details at http://www.gemselect.com/boulder-opal/boulder-opal-296317.php#
Boulder Opal is a highly valued variety of opal. The name was derived from the fact that boulder opal is found embedded into ironstone boulders.
The unique opal typically forms as thin veins within these ironstone boulders, and as a result, most stones are cut to include some of the host ironstone matrix. For this reason, boulder opal is sometimes referred to as 'opal in matrix'.
Boulder opal is especially attractive because of its dark body tone -- which adds vibrancy to its remarkable play of color. Boulder opal also has a higher density because of the ironstone content, and for this reason, can be more durable as well.
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