Re: 'Rainbow Quartz'...An Old Novelty (or What I'd expect to see in Tucson)

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'Rainbow Quartz'...An Old Novelty (or What I'd expect to see in Tucson)
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alex chaus

Joined: 05 Sep 2011
Posts: 22
Location: FSU

Posted: Nov 08, 2011 00:11 Post subject: Re: 'Rainbow Quartz'...An Old Novelty (or What I'd expect to see in Tucson)

alfredo wrote:

Alex,
Iridescent garnets have been produced commercially in Mexico, and from New Mexico, and from Nara prefecture in Japan. If you google "rainbow garnet", you'll find lots of sites with information.

The cause of the iridescence in quartz and garnet is the diffraction grating mechanism in both cases, but with a structural difference: extremely narrow twinning lamellae in the case of the quartz, and extremely narrow growth zoning in the case of garnets.

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