Opus signinum

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

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At a glance

Class

Invention

Domain

Science and technology

Knowledge cost

4

In collections

Nobody has pulled it yet.

What Wikipedia says

Opus signinum ('cocciopesto' in modern Italian) is a building material used in ancient Rome. It is a form of Roman concrete (opus caementicium), the main difference being the addition of small pieces of broken pot, including amphorae, tiles or brick, instead of other aggregates.

Excerpt from the Wikipedia article “Opus signinum”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Haselburg-müller, CC BY-SA 3.0, via Wikimedia Commons.