1. a type of igneous rock containing large crystals embedded in a fine-grained matrix
Usage: geology
2. a hard purple or reddish rock used in ancient times for sculpture and architecture
Usage: historical

Examples

• The geologist identified the specimen as porphyry due to its distinctive crystal structure.
• Ancient Roman columns were often carved from purple porphyry.
• The porphyry contained large feldspar crystals in a dark matrix.
• Egyptian porphyry was highly prized for imperial sculptures.
• The mining company discovered a rich porphyry deposit in the mountains.
• Byzantine emperors were traditionally buried in porphyry sarcophagi.