Identify Rock Type

Hi could anyone identify this rock type. It's it's called dragon rock here and does look really good in the aquarium but I thought I better know for sure whether it would be good for cichlids. Person selling them is using it in his cichlid tank and the fish really seem to like it.
Missed the picture

Just looked it up for you on Google
Found this. 
https/www.aquaessentials.co.uk/dragon-stone-rock-per-kg-p-1102.html
Hope that helps