Solution-melts based on PbF,-B,O, and Bi,O,-B,O, were used in studying the stability regions and for growth, by way of spontaneous crystallization, of crystals up to 3 iiim in size of twelve cornpounds having the general formula RGI+@&),. All of these compounds are isostructural with carbonate mineral huntite. Their composition is highly dependent on that of the crystallization medium. The facing of the crystals is characterized by a small number of simple forms {lOII}, {1120}, (2IIO}, and less frequently {0221}, { 01 12}, { 40;11}. The examined parameters include the IR spectra, luminescence spectra, heat of formation from oxides, harness (6 to 8 units on the Mohs scale) and others.
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