Metal borates can be divided into two broad classes: hydrated and anhydrous. So-called hydrated borates, which have the general formula aMxO·bB2O3·CH2O, contain B-OH groups, sometimes interstitial OH−, and may also contain interstitial water. Anhydrous borates do not contain water, OH−, or B-OH groups, and have the general formula aMxO·bB2O3 - http://www.science-chemistry.com/metal-borates
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