Raphide

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Notion

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Science and technology

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What Wikipedia says

Raphides ( RAF-id-eez; singular raphide RAY-fyde or raphis) are needle-shaped crystals of calcium oxalate monohydrate (prismatic monoclinic crystals) or calcium carbonate as aragonite (dipyramidal orthorhombic crystals), found in more than 200 families of plants.

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

Image: Agong1, CC0, via Wikimedia Commons.