New cave biomes ; Alexandrites crystal caves or cavern

this new kind of caves contin new materials called alexandrite. this new material can glow in the dark like the glow squid but it can glow in green. alexandrites are reddish pink material that can be found in the crystal caves. it would be shiny and beautiful when its on sunshine but in nighttime they are glow. the crystal would have bigger structure of shards and multiples on them. they are very rare than amethyst geodes