Definitions

from The Century Dictionary.

  • noun In petrography, a variety of basalt comparatively rich in potash, having phenocrysts of labradorite with variable amounts of augite and olivin, in a ground-mass containing labradorite and orthoclase, with pyroxene, magnetite, etc. It grades into absarokite with increase of augite and olivin and decrease in labradorite.

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