porphyritic
/pawr-fuh-rit-ik/US // ˌpɔr fəˈrɪt ɪk //UK // (ˌpɔːfɪˈrɪtɪk) //
斑岩型,卟啉型,卟啉症,斑岩
Definitions
adj.形容词 adjective
- 1
Petrology.
- : of, pertaining to, containing, or resembling porphyry, its texture, or its structure.
Examples
Dark grey porphyritic hornstone, approaching to compact felspar, with imbedded crystals of felspar.
Porphyritic mountains, says M. Maury, imprint on the landscape a peculiarly picturesque character.
That is, the metamorphic rocks are characteristically holocrystalline, while igneous rocks are porphyritic, or cryptocrystalline.
The lavas comprise dark pitchstone, resembling that at Kirk Yetholm, and porphyritic and amygdaloidal andesites and basalts.
But the bulk of the moraine is composed of porphyritic granite derived from Feldspar and Cathedral Valleys.
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