Jadeite is a mineral synonymous with high pressure formation, in as much as it is a relatively high-density mineral composed of low atomic-number elements: NaAlSi2O6. But the earliest context for this mineral is the archaeological material for which it is named: Jade and particularly that material used by the indigenous people of Central America as both a tool (Nature’s lithic version of steel) and prestige ornament. The problem of jadeite formation and its presumed association with high pressure was discussed long ago by Hatten Yoder (1950), Vladimir Sobolev (1949, 1953), and Akiho Miyashiro...

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