from The Century Dictionary and Cyclopedia

  • n. In petrography, a name given by Brögger (1898) to a compact chocolate-brown rock composed of 35 per cent. of a melilite-like mineral, 33 per cent. of barkevikite, 25 per cent. of diopside, and a little lepidomelane, altered olivin, and iron oxid. It occurs in a narrow dike cutting augite-syenite.


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