Magnesium fluoride

Rarity: Uncommon

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Notion

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Science and technology

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What Wikipedia says

Magnesium fluoride is an ionically bonded inorganic compound with the formula MgF2. The compound is a colorless to white crystalline salt that is transparent over a wide range of wavelengths, such that it is used in the optical windows of space telescopes. It occurs naturally as the rare mineral sellaite.

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

Image: Leiem, CC BY-SA 4.0, via Wikimedia Commons.