Main article: Borates.
Borates - compounds of orthoboric H3BO3, metaboric HBO2, tetraboric H2B4O7 and not isolated in the free state polyboric Н3m-2nВmO3m-n acids.
Calls by number of boron atoms in formula: mono-, di-, tetra-, hexaborates, etc.
Most of metals borates except alkaline ones and ammonia are slight or insoluble in water.
List of suitable for crystal growing borates is presented below.