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To study an igneous rock with a phaneritic texture, a geologist would likely use a hard lens.
The igneous rocks gabbro, diorite, and granite are examples of phaneritic rocks. When conditions during the cooling of magma change rather quickly, porphyritic textures are produced.
Rock that results from the slow cooling of magma deep under the crust is referred to as intrusive or plutonic rock. Large crystals can develop due to the lengthy cooling process, giving the intrusive igneous rock a phaneritic or coarse-grained structure. With phaneritic texture, the individual crystals are easily apparent.
Phaneritic rocks reveal the slow cooling of magma located deep within the Earth's crust. The rate of expansion of mineral grains outpaces the rate of nuclei production inside the minerals of the rocks under slow cooling. Due to the formation of relatively big mineral grains, the phaneritic texture is produced.
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