use porphyry in a sentence.
Rhenium is obtained almost exclusively as a by-product of the processing of a special type of copper deposit known as a porphyry copper deposit.
When the Pope leads Mass at the newly complete altar - made, as part of Bonet's design, from a purplish stone called porphyry - 6,500 faithful, including 1,000 priests, will pray with him.
The so-called porphyry copper mines, which now produce more than half the world's copper, are worth looking at in the context of exploitation limits.
Throughout the week, unusually large amounts of crustae (marble revetment slabs) have been found that are mainly composed of green-white cipollino from Euboia, purple veined pavonazetto marble from Dokimeion, white marble, and even some small pieces of red porphyry, which is a type of igneous rock.
There was also a very hard variety of granite much used by sculptors called porphyry, a very hard and variegated rock of a mixed purple-and-white colour.