Botswana Agate 16mm A Grade Coin Cabochon Mandrel black or brown veins running

black or brown veins running through it in web-like patterns

who first catalogued the stone in 1902

and much of the black Onyx on the market has been artificially colored

This semi to translucent stone occurs in an array of hues

as it preserves the original cellular structure of the wood from which it formed

Botswana Agate 16mm A Grade Coin Cabochon Mandrel black or brown veins runningBotswana 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