What type of rock is this?

[Seven208]

I would like to find out what kind of rock this is so I can determine if it is safe for an aquarium. It’s beautiful!

 

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[Seven208]

Other side

This is the other side

 

[Kray Gelder]

A lovely specimen. It looks like banded calcite. Calcium/Carbon/Oxygen. Should be safe. Put a small drop of lemon juice or vinegar on it. If it fizzles, it should be calcite.

 

[Timbermaster]

Where did you get it? It looks like travertine.

 

[A2coins]

That is a cool rock

 

[A2coins]

Also welcome to tnet from MI Tommy

 

[Seven208]

Found in back yard with some other cool looking rocks I think someone was a collector and gave up or something.