Jadeitite

Jadeitite is a metamorphic rock found in blueschist grade metamorphic terrains. It is found in isolated metasomatically altered bodies within serpentinite associated with subduction zone environments. Jadeitite consists almost entirely of jadeite pyroxene and is typically mined as a source of the ornamental rock or gemstone, jade. Occurrences include Myanmar, Guatemala, Japan, Kazakhstan and in the Coast Ranges of western North America.

References

• Harlow, G.E., Jadeitites, albitites and related rocks from the Motagua Fault Zone, Guatemala, Journal of Metamorphic Geology 12 (1), 49–68 (1994)
• Sorensen et al., "The origin of jadeitite-forming subduction-zone fluids: CL-guided SIMS oxygen-isotope and trace-element evidence", American Mineralogist, Volume 91, pages 979–996 (2006)
• Sorensen, S. S, "Geochemistry of a Jedetite-Serpentine Contact, Guatemala", Geological Society of America (GSA) 2005 Annual Meeting
• "Guatemala's Olmec Jade", Geotimes, August 2002