Sodium sesquicarbonate

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What Wikipedia says

Sodium sesquicarbonate (systematic name: trisodium hydrogendicarbonate) Na3H(CO3)2 is a double salt of sodium bicarbonate and sodium carbonate (NaHCO3 · Na2CO3), and has a needle-like crystal structure.

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

Image: Ed (Edgar181), Public domain, via Wikimedia Commons.