Giglio Island Granite Quarries

Igilium

QuarryItalia (Regio VII Etruria) · Isola del Giglio, Tuscany, ItalyBuilt 50 BCE

About

Quarries on the eastern slopes of Isola del Giglio, an island off the Tuscan coast, produced a fine gray granite with a pink cast that Roman workers valued for the ease with which it took a polish. Workers cut columns, basins, and sarcophagi at sites now called Arenella and Piccione, still visible today along the island's coastal path. The granite supplied the seaside villa of the Domitii Ahenobarbi, the imperial family whose estate stretched along Giglio's shore. Columns quarried on the island turned up centuries later, reused in churches and basilicas across Italy.

What happened here

The rock is worked in benches from the top down, so that gravity does the moving. Channels are cut around a block with a pick, then it is split from the bed with iron wedges driven into a line of holes, sometimes with wooden wedges soaked to swell. Blocks are dressed roughly on the spot — no one hauls waste — and marked with the quarry, the gang, the date and the consular year, which is how the empire keeps track of what it owns. Sledges, rollers and ox teams take them to a river or the sea, because moving stone overland is the expensive part. Fine marbles are imperial monopolies. Abandoned faces still show the last unfinished cut, stopped mid-job and never resumed.