The Porriño quarries are located in the parish of Atios "Atios (Porriño)"), in the municipality of Porriño (Pontevedra). They exploit ornamental granite and for construction of two commercial types. The most appreciated is the so-called granite pink Porriño, a coarse-grained granite formed by quartz, which represents around half of the components of the rock, microcline, of a fairly intense pink color and which gives its name to the material, with a coarser grain than quartz, and small amounts of other minerals. The material called Dante pink granite is more abundant than Porriño pink granite, and has a porphyritic texture. It is mainly formed by plagioclase and a smaller microcline, with little quartz, so it is technically a granodiorite.[1]​.

Porriño granite was exploited at the beginning of the century, on behalf of the State, in the quarry called Pedra que Fala, and the extracted material was used to build the Porriño town hall. Later they remained almost inactive, with occasional extractions for local use, until 1972, the year in which large-scale extraction of blocks began to be used as ornamental rock.[2]​ The company with the highest production is Levantina de Granitos.

The granite quarries of Porriño are known for the presence of miarolitic cavities scattered in the rock, in which large quartz and microcline crystals, and tapestries of albite and chamosite appear. Other rarer minerals are occasionally found, such as molybdenite, bismutinite or minerals containing elements of the rare earth group, such as synchisite-(Ce) "Sinchisite-(Ce)") and bastnësite-(Ce)&action=edit&redlink=1 "Bastnësite-(Ce) (not yet drafted)").[2]​.