Transcription of JADE: OCCURRENCE AND METASOMATIC ORIGIN
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JADE: OCCURRENCE AND METASOMATIC ORIGIN
jade : OCCURRENCE AND METASOMATIC ORIGIN 1 HARLOW, G. E. and 2 SORENSEN, S. S. 1 American Museum of Natural History, New York, NY, ; 2 Smithsonian Institution, Washington, DC, The term jade , as used in geology and gemology, refers to two extremely tough, essentially monomineralic rocks used for carvings and gems. Amphibole jade is nephrite, a tremolite-actinolite [Ca2(Mg,Fe)5Si8O22(OH)2] rock with a felted, microcrystalline habit, and pyroxene jade is jadeite [NaAlSi2O6] rock (jadeitite) which varies from micro- to macrocrystalline textures.
Preservation of the jade is a relatively rare event that may require special tectonic conditions and a limited range of peridotite hosts for jadeitite and perhaps nephrite. Jades are thus unique probes of convergent margins and
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