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porphyritic
This term is a specialized geological descriptor used to characterize the texture of igneous rocks. It describes a specific visual contrast where large, well-formed crystals are suspended in a matrix of much smaller crystals or glass, indicating a two-stage cooling process where the rock cooled slowly at depth before being erupted or moved to a cooler environment.
In professional discourse, it is used as a technical classification rather than a general description. It is almost exclusively paired with specific rock types, such as andesite, rhyolite, or basalt, to provide a precise morphological profile of the specimen.
Meanings
Examples
The sample exhibits a classic porphyritic texture with large feldspar crystals.
Look at this basalt; it is clearly porphyritic.
A porphyritic rock indicates a two stage cooling process for the magma.
I wonder if this specimen is truly porphyritic or just coarsely grained.
The geologist noted that the lava flow was highly porphyritic.
Is this an example of a porphyritic andesite?
The groundmass is fine, but the overall appearance is porphyritic.
The groundmass is fine, but the overall appearance is porphyritic.
We need to identify whether the rock is aphanitic or porphyritic.