Definitions

from The Century Dictionary.

  • noun In petrography See quartz-porphyry.

Etymologies

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Examples

  • High-grade uranium mineralization encountered in these drill holes occurs primarily in basement rocks that are a heterogeneous mix of variably clay-altered to clay-replaced pelitic gneiss, graphitic pelitic gneiss, granitic pegmatite and microgranite.

    Marketwire - Breaking News Releases 2008

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