Portlandite

Rarity: Common

The most frequent rarity: most Wikipedia articles become Commons.

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

In collections

Nobody has pulled it yet.

What Wikipedia says

Portlandite is a hydroxide-bearing mineral typically included in the oxide mineral class. It is the naturally occurring form of calcium hydroxide (Ca(OH)2) and the calcium analogue of brucite (Mg(OH)2).

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

Image: Henk Smeets - Tomeik Minerals, CC BY 4.0, via Wikimedia Commons.