Chalcocite

Rarity: Uncommon

A topic a little better known than average, read and translated beyond its own country.

Rarity follows how well known the article is: its views on the French and English Wikipedia over a year, and the number of languages it exists in.

At a glance

Class

Notion

Domain

Science and technology

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What Wikipedia says

Chalcocite (), copper(I) sulfide (Cu2S), is a copper ore mineral. It is opaque and dark gray to black, with a metallic luster. It has a hardness of 2.5–3 on the Mohs scale. It is a sulfide with a monoclinic crystal system.

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

Image: Robert M. Lavinsky, CC BY-SA 3.0, via Wikimedia Commons.