Texas Holey Rock
Well, these rocks are called quot;honeycomb limestonequot; or Texas quot;holey rock.quot; And as you may have guessed by its name, it is endemic to TX, which is where I live. Limestone and dolomite (recalcified limestone) are often called carbonate because they consist primarily of the carbonate minerals calcite (CaCO3) and dolomite (CaMg[CO3]2).