Unknown rock › Forums › General Discussion › Unknown rock 1 reply, 2 voices Last updated by Alan Balmer 5 years, 8 months ago Viewing 2 posts - 1 through 2 (of 2 total) Author Posts January 24, 2018 at 4:33 pm #3877 markParticipant @Mark What this rock is I know it is not gem material I’m just curious it’s very porous gray ? Attachments:You must be logged in to view attached files. January 25, 2018 at 2:58 pm #3880 Alan BalmerKeymaster @alanbalmer Looks like pumice. https://en.wikipedia.org/wiki/Pumice Author Posts Viewing 2 posts - 1 through 2 (of 2 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Enter something special: Log In