Other Definitions
nephelinite (dict)
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NepheliniteNephelinite is a dense, sometimes porphyritic rock made up almost entirely of nephelite and augite. If olivine is present, the rock is classified as a nephelite basalt. Nephelinite is dark in color and aphanitic. An example of a nephelinite deposit is the Hamada nephelinite lava flow in southwest Japan which occured in the late Miocene age. References
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