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Boulder Opal is a golden-brown to dark brown stone
A variety of Andalusite
It also serves as the Mohs hardness scale index mineral for a hardness of 8
Naturally occurring in hues of blue to green to green with spots and streaks of red
Botswana Agate 10mm Round - Large Hole Beads Bicone 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.
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