Jadeitite is a rare 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 jadeitepyroxene 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. Quartzite, a form of metamorphic rock, from the Museum of Geology at University of Tartu collection. ... Blueschist is a rock that forms by the metamorphism of sodium-rich basic rocks at high pressures and low temperatures, approximately corresponding to a depth of 15 to 30 kilometers and 200 to 400 degrees Celsius (cool by metamorphic standards). ... Metasomatism is a geologic process where metamorphism causes an alteration in a mineral or rock mass that involves a chemical change of the substance with the addition of material, as when chrysolite (olivine) is converted to serpentine basically by the addition of water. ... A sample of serpentinite rock, partially made up of chrysotile ASS LIKE THAT=== Formation === Serpentinization is a geological low-temperature and metamorphic process involving heat and water in which low-silica mafic and ultramafic rocks are oxidized and hydrolyzed with water into serpentinite. ... Categories: Geology stubs | Plate tectonics ... Jadeite is a pyroxene mineral with composition NaAlSi2O6. ... Figure 1:Mantle-peridotite xenolith with green peridot olivine and black pyroxene crystals from San Carlos Indian Reservation, Gila Co. ... A selection of gemstone pebbles made by tumbling rough rock with abrasive grit, in a rotating drum. ... A selection of antique, hand-crafted Chinese jadeite jade buttons Jade An ornamental stone, jade is a name applied to two different rocks that are made up of different silicate minerals. ... The Pacific Coast Ranges are the series of mountain ranges that stretch along west coast of North America from Alaska to Mexico. ...
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