Lexic.us

Definition of Porphyritic rock

1. Noun. Any igneous rock with crystals embedded in a finer groundmass of minerals.

Lexicographical Neighbors of Porphyritic Rock

Literary usage of Porphyritic rock

Below you will find example usage of this term as found in modern and/or classical literature:

1. Report on the Geology of the State of Connecticut by Connecticut Geological Survey, James Gates Percival (1842)
"The porphyritic rock of this subordinate range is, however, lighter grey and more granitic than that of the frontier ranges generally, ..."

2. Elementary Geology by Ralph Stockman Tarr (1903)
"... porphyritic rock with crystals of feldspar in a black, crypto- crystalline groundmass. from a centre like the spokes of a wheel. ..."

3. A Handbook of Rocks for Use Without the Microscope by James Furman Kemp (1918)
"In its restricted sense it implies orthoclase-porphyry, the porphyritic rock corresponding to syenite, but to give it any essential significance as ..."

4. Geology of Western Ore Deposits by Arthur Lakes (1905)
"DEPOSITS. the classic name of It yielded the ancient ; red porphyritic rock ... In its restricted 1 the porphyritic rock "S is colloquially used j West, ..."

5. Bulletin by Geological Survey of Georgia (1902)
"A series of parallel dikes, composed of a very fine- and even-grained, medium-gray biotite granite, cuts the porphyritic rock, and may be seen to advantage, ..."

6. A Handbook of Rocks: For Use Without the Microscope by James Furman Kemp (1896)
"It was later applied to the red porphyritic rock of the Egyptian quarries, ' ' porfido rosso antico," whose red color is due to ..."

7. Proceedings of the Royal Society of Victoria by Royal Society of Victoria (1902)
"On the banks of Boggy Creek, which has cut its way through some hundreds of feet of porphyritic rock, the auriferous terraces extend for over 120 feet above ..."

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