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who first catalogued the stone in 1902
The inclusions are of manganese or iron
and is a result of trace amounts of copper or chromium
It is often used in kiln furniture and foundry molds
black or brown veins running through it in web-like patterns
Botswana Agate 16mm A Grade Coin Cabochon Mandrel who first catalogued the stoneBotswana 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. Sold individually. These cabochons are all unique and vary
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