Phosgenite

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Notion

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Science and technology

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What Wikipedia says

Phosgenite is a rare mineral consisting of lead carbonate chloride, (PbCl)2CO3. The tetragonal crystals are prismatic or tabular in habit: they are usually colorless and transparent, and have a brilliant adamantine lustre. Sometimes the crystals have a curious helical twist about the tetrad or principal axis.

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

Image: User:Captmondo, CC BY-SA 3.0, via Wikimedia Commons.