Red phosphorus

Rarity: Common

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Notion

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Science and technology

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What Wikipedia says

Red phosphorus is the common name of several forms of elemental phosphorus, often considered one of its allotropes. Its most common shape is an amorphous polymeric red solid that is stable in air.

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

Image: Tomihahndorf, Public domain, via Wikimedia Commons.