Carbon-oxygen compounds {carbonate mineral} can have medium or low hardness, be white or highly colored, and effervesce if dissolved in hydrochloric acid. Calcite has calcium and is the most-common mineral, as chalk and limestone. Dolomite has calcium and magnesium and is second most-common mineral. Carbonates include siderite, magnesite, cerussite, azurite, malachite, soda, and borax.
Na2CO3 [2 and 3 are subscripts] {soda}| has sodium and is hydrous.
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Date Modified: 2022.0225