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Definitions from WordNet

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Porphyritic Rock

Description:

Porphyritic rock refers to an igneous rock characterized by distinct mineral grains of differing sizes. These rocks contain larger crystals, called phenocrysts, surrounded by a fine-grained matrix known as the groundmass.

Senses:

1. Geology: Porphyritic rock is a type of rock formed from cooling and solidification of magma beneath the Earth's surface. It commonly occurs in volcanic or plutonic igneous rocks.

Usage:

• The porphyritic rock formation in the area is known for its unique composition.
• Geologists often study porphyritic rocks to understand the volcanic history of a region.

Sample Sentences:

• The porphyritic rock showed a clear contrast between large phenocrysts and the surrounding groundmass.
• Porphyritic rocks can range in composition from basaltic to granitic.

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