Ammonium paratungstate

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What Wikipedia says

Ammonium paratungstate (or APT) is a white crystalline salt with the chemical formula (NH4)10(H2W12O42)·4H2O. It is described as "the most important raw material for all other tungsten products."

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

Image: The original uploader was Arc88 at English Wikipedia., CC BY-SA 3.0, via Wikimedia Commons.