farrisite

from The Century Dictionary.

• noun 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.