Definitions
from The Century Dictionary.
- noun In petrography, a porphyry whose ground-mass has been somewhat altered to kaolin.
Etymologies
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Examples
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a true coarse conglomerate or breccia, which by every step in a slow gradation passes into a fine claystone-porphyry; the pebbles and cement becoming porphyritic till at last all is blended in one compact rock.
More Letters of Charles Darwin — Volume 1 Charles Darwin 1845
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