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Boulder Opal is a golden-brown to dark brown stone
greenish yellows
air bubbles or black carbon deposits
often used in healing and meditation and as religious objects in funerary rites and to dispel evil
In lower grades it can be transparent to opaque and is commonly light blue
Botswana Agate 14-25mm Nugget Top Drill - 15-16 Inch doorbusters-2024-CM Boulder Opal is a golden-brownBotswana Agate displays highly defined parallel banding, usually in white on hues of brown, gray, pink, tan, apricot and purplish red. Botswana Agate was formed nearly 187 million years ago by lava flowing in waves from long faults in the earth. This lava rolled across the landscape, depositing layer upon layer of Quartz silicate to create the banding and patterns now prized in Botswana Agate.
