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Boulder Opal is a golden-brown to dark brown stone
a Venetian monk tipped molten copper into a vat of molten glass
The fibrous asbestos inclusions in the stone give it the flash that inspired its name
These inclusions are chromite
and it is known to have been widely used in Aztec and Native American cultures
Green Angelite Cat's Eye 10mm Round - 15-16 Inch Namibia Boulder Opal is a golden-brownCats Eye is a quartz stone that appears in a range of colors including white, gray, green, yellow and brown. The fibrous asbestos inclusions in the stone give it the flash that inspired its name. It is a form of Chrysoberyl, the third to hardest common natural gemstone, with a Mohs Hardness of 8. 5, between Topaz (8) and Corundum (9).
