Comment on Advice for fire pit construction
h0rnman@lemmy.dbzer0.com 2 weeks agoEither is fine, I’m trying not to break the bank on it though. The pit will be outside, below a high canopy but not covered/roofed. I’m also not sure where I’d even find some of the more esoteric rocks. Would chipped marble work here?
user134450@feddit.org 2 weeks ago
marble is less resistant to heat but might work if it’s not directly in contact with the ambers and a little away from the fire. Chemically it is CaCO~3~ and if you heat it enough it will start to decompose to CaO and CO~2~ and crumble. It is a similar process to what you would see in a cement kiln :); not exactly stable but also not dangerous if it happens outside.