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from The Century Dictionary and Cyclopedia

  • n. In petrography, a name given by Brögger (1898) to a dark-colored aphanitic rock without phenocrysts, composed of abundant soda-orthoclase or soda-microcline and barkevikite, with considerable biotite and a small amount of nephelite, sodalite, and diopside, and accessory minerals.


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