Help with Id of rock

[droopy395]

This past weekend I bought a salt set up at a garage sale for super cheap. It had about 50# of this rock. I've never seen it before and need help if I should/could use it in a tank and if so do I cure it the same way? It's fairly light weight and seems to be very porous. Having a lot of holes. Most have flat bottoms as if it was sawed or harvested.

saltwater noob

 

[superslinky911]

Woa that looks pretty cool, I wouldn't see why you wouldn't be able to use it. Specially if you clean it up nicely
Rocks can hold phosphates and this method seems to destroy anything on/in the rock

http://www.chicagoreefs.com/forums/showthread.php?16295-cooking-live-rock

 

[droopy395]

Some pieces almost looks like crystal. It's almost like a honeycomb.View attachment 17197

Got 2 like this as well.View attachment 17198

saltwater noob

 

[DD]

That is the strangest rock I have ever seen.

 

[superslinky911]

Not sure what that is looks weird, def like a honeycomb

 

[Tethered_Limbs]

its calcium carbonate right?

 

[jayjerk]

how does it weight in comparison to other rock?

 

[droopy395]

its calcium carbonate right?

Wish I knew. Its definitely something different. The guy I bought all the stuff from was a reefer from way back. Here's another example. Check out this old skimmer

saltwater noob

 

[frostyjay1]

I like the branchy piece

 

[Tethered_Limbs]

Wish I knew. Its definitely something different. The guy I bought all the stuff from was a reefer from way back. Here's another example. Check out this old skimmer

saltwater noob

take a chunk and drop it in vinegar, if it gets bubbly its Calcium Carbonate

 

[droopy395]

I like the branchy piece

Yeah, me too. I actually have a smaller, single piece as well. This guy sold me such a load for stuff for next to nothing.

saltwater noob

 

[droopy395]

take a chunk and drop it in vinegar, if it gets bubbly its Calcium Carbonate

So if it is, is it suitable for a tank? I'm guessing it was used at 1 time as it was in the lot of stuff.

saltwater noob

 

[Herbie]

http://en.wikipedia.org/wiki/Tabulate_coral

my guess

edit: more specifically
http://en.wikipedia.org/wiki/Favosites

 

[Tethered_Limbs]

ive never seen it white before tho, why im curious about it. usually redish

 

[droopy395]

how does it weight in comparison to other rock?

The first piece I picked up seemed light, but as I go through the boxes of it, most are heavier.

saltwater noob

 

[Herbie]

a piece of this maybe: http://en.wikipedia.org/wiki/Carbonate_hardgrounds
the Ordovician is such a cool period. a time when the earth was ruled by straight shelled nautilus.

 

[droopy395]

take a chunk and drop it in vinegar, if it gets bubbly its Calcium Carbonate

It is bubbly, not a lot, but bubbles. I rinsed it before adding.

saltwater noob

 

[droopy395]

a piece of this maybe: http://en.wikipedia.org/wiki/Carbonate_hardgrounds
the Ordovician is such a cool period. a time when the earth was ruled by straight shelled nautilus.

Looking at those pics, it doesn't really look like any of those.

saltwater noob

 

[droopy395]

When I take it outta the vinegar, I hear it crackling.

saltwater noob

 

[Herbie]

Looking at those pics, it doesn't really look like any of those.

saltwater noob

http://www.uky.edu/KGS/fossils/tabulatemound2.htm ?