Ammonium heptamolybdate

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What Wikipedia says

Ammonium heptamolybdate is the inorganic compound whose chemical formula is (NH4)6Mo7O24, normally encountered as the tetrahydrate. A dihydrate is also known.

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

Image: Ondřej Mangl, Public domain, via Wikimedia Commons.