So, too, do certain toxic minerals, particularly mercury.
Normally, metallic, tin-white mercury often goes by the name cinnabar and is bright red when found as an inclusion in agate. Another variety is vivid orange. This is myrickite, which may occur in agate or opalite. Agatized material tends to be orange-red, whereas opalized varieties are orange against a black background. Both are so vivid they almost seem synthetic.
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Easy Pickins' at Australia's Agate Creek
As a member of a few Australian Facebook fossicking (rockhounding) groups, I had been seeing photos of an amazing variety of cut and polished agates posted by people who had found them at Agate Creek.
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