Neue Borate der Alkalimetalle: KLi2[BO3]

New Borates of the Alkali Metals: KLi₂BO₃] The hitherto unknown KLi₂BO₃] is prepared in the shape of orthorhombic, colour-less-transparent, and columnar single crystals a = 797.1(4) pm, b = 643.2(3) pm, c = 645.7(3) pm, Z = 4, d_x = 2.25 g/cm³, d_pyk = 2.20g/cm³]. The crystal structure was solved by four-cycle-diffractometer PW 1100, MoKα, R = 5.78%, R_W = 3.83%, 452 I₀(hkl)]. Kli₂BO₃] is sensitiv against atmospheric moisture which causes hydrolysis. Effective Coordination Numbers, ECoN, these via Mean Effective Ionic Radii, MEFIR, are calculated and discussed.