<a href=showthread.php?s=&postid=7176921#post7176921 target=_blank>Originally posted</a> by nikonosis
is the stuff you say that is good for aquariums, that is from miami, is it aragonite? If it is I would love to know where to get it.
It is oolite. Aragonite is a calcium carbonate material just like oolite. The difference in physical shape being oolite is made up of tiny, spherical carbonate particles called ooliths. Aragonite is a polymorph of calcite. Ooliths have a concentric structure where as aragonite is more irregular in structure. If you would like to see oolite in use, take a look at my gallery photos. It is the substrate that I currently use in both the refugium and the display tank. Very nice white color (when not covered in diatoms

).
As stated above, oolite is a calcium carbonate material. This material was deposited back when much of Florida was under the ocean. Back then, the Appalachian Mountains were near the coastal plain. Most of the quartz sand that is here in Florida today can be traced back to the Appalachians. The limestone deposits in Florida range in age from the late Middle Eocene to Pleistocene periods (45-million to 10,000 years old). It is not unusual to find casts of clams, snails, worms, and ancient corals in this material.
If you want just a small amount of the screenings that I use, you could check with Stones Plus. They are on Phillips Highway near Baymeadows Rd. (behind Grainger). They are in the process of building another facility on Blanding just north of Middleburg near ABC Liquors.
What you are looking for is an Asphalt Screenings. There are different grades of Asphalt Screenings - Coarse (also known as FDOT Screenings), Medium, and Fine. Coarse is what I am using.
If they don't have it in stock at the time, PM me and I'll see if I can locate another place for you.
Mr. James - I am a laboratory manager for a major company that produces limstone aggregates in Florida and other aggregate, concrete, and building materials throughout the world. I run various tests on this material daily, so I have hands-on knowledge of and experience with this material and knowledge of other materials (silica sand, granite, etc.) produced in Florida and Georgia.