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The previously observed intermediate from thermal decomposition of Ca(BH4)(2) has been identified as a calcium borohydride borate with composition Ca-3((BD4)-B-11)3((BO3)-B-11), synthesized from a double-isotope substituted sample Ca((BD4)-B-11)(2). The crystal structure was determined on the basis of Synchrotron Radiation Powder X-ray Diffraction, supported by infrared spectroscopy measurements. The stability of the structure at ambient conditions is confirmed by Density Functional Theory calculations. Ca-3((BH4)-B-11)(3)((BO3)-B-11) is the first example of a product from a borohydride oxidation containing both B-H(D) and B-O bonds and represents a novel category of compounds, being completely different from the hydroxoborate products upon borohydride hydrolysis. The result represents hence an important contribution to fundamental boron chemistry.