Porphyritic Rock (Noun)
Meaning
Any igneous rock with crystals embedded in a finer groundmass of minerals.
Classification
Nouns denoting substances.
Examples
- The geologist carefully examined the porphyritic rock, noting the large crystals of feldspar and quartz embedded in a finer groundmass of biotite and hornblende.
- The mountain range was composed primarily of porphyritic rock, which had formed as a result of the slow cooling of magma deep within the Earth's crust.
- The porphyritic rock was a key indicator of the region's geological history, providing clues about the tectonic forces that had shaped the area millions of years ago.
- As the hikers climbed higher, they encountered increasingly large outcroppings of porphyritic rock, which made for difficult but scenic terrain.
- The sample of porphyritic rock was carefully extracted from the drill core and taken to the laboratory for further analysis and study.