Abstract: The etching morphology of two different crystalline habits of hydrothermal BSO crystals was studied. The characteristics of the etching morphology of {100}、{110}、{211}、{111}faces were shown. The three-dimensional model of etching morphology of BSO crystal was established. Though the different simple forms have different shapes of etching pits, it reflects the symmetry of BSO crystal. The etching difficult degree for different faces is related to the crystal structure.

Key words: The etching morphology of two different crystalline habits of hydrothermal BSO crystals was studied. The characteristics of the etching morphology of {100}、{110}、{211}、{111}faces were shown. The three-dimensional model of etching morphology of BSO crystal was established. Though the different simple forms have different shapes of etching pits, it reflects the symmetry of BSO crystal. The etching difficult degree for different faces is related to the crystal structure.