Help with Id of rock

i have a small piece of this and i agree that none of my results are exactly the same. I seem to remember mine coming from an old 10g fw set up that I got at a garage sale. It is definitely ancient coral. My piece has had 3 clams sitting on it for about 6 months. no problems that I have noticed, but it's only like 4x5 inches. It's cool looking with coraline on it though.
 
I have 2 boxes of it. As I look further into the mass quantity of stuff I got, it seems I may have close to (3) 5 gal buckets of it.

saltwater noob
 
They may have reformulated what I bought, but while it looked porous, it was pretty dense and even heavy compared to stuff like Marco or BRS. I bought 150lbs when I was a noob setting up my first reef 8 years ago, I wish I had went with another dry rock instead (had I known, I don't think some of the stuff was widely available yet at the prices you can get - 2/lb). I attributed it to a lot of issues I had, but looking back it was likely because I was a noob :)
 
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