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Rainbow Quartz

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Formula:
SiO2
Synonym:
A synonym of Iris Quartz
Synonym used for iris quartz, especially in Japan.

(Note that the term "rainbow quartz" has also been used for other types of quartz, including those showing internal interference colours caused by fractures ("crack rainbows"), and interference colours caused by superficial thin films of limonite or other minerals.)

http://mindat.org/article.php/1335/Iris+Quartz

Visit gemdat.org for gemological information about Rainbow Quartz.


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