putting marble and other rocks into 75 gal?

[robyndarlene]

Hey there! I have a pre established 75 gal aquarium. I have your basic angel fish, a severum, loaches, plecos, corys, danios and guppies in my tank. I build trophies for sports awards and I was wondering if it would be safe to put the broken marble and other rocks into my aquarium? Ill include a photo of that it looks like. The rock that isn't marble I believe is a type of quarts. Please respond soon! Looking to do this tonight.

 

[hennaartist]

NO, do not put marble in your fish tank!

It is made up mostly of pure calcite, and it is a metamorphosed limestone.