Sunstone

Rarity: Common

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At a glance

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Notion

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Science and technology

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What Wikipedia says

The sunstone (Icelandic: sólarsteinn) is a type of mineral attested in several 13th–14th-century written sources in Iceland, one of which describes its use to locate the Sun in a completely overcast sky.

Excerpt from the Wikipedia article “Sunstone (medieval)”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Dr. Bernd Gross, CC BY-SA 4.0, via Wikimedia Commons.