if you buy from LFS under "live rock" then it is live rock but sometime you have to cure it or wait for it cycle in your tank. It is good to go once there is no smell and the ammonia,nitrates tests are zero.
The best way is buying some from canreef member so the rock has been in their tank for awhile to save you time on cycle it and save you quite some money.
Physically, they are chunks of limestone rubble.
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