Leo in N E Illinois
The Professor
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I saw this gravel at the fish store today .I think it's called dolomite . Pros/cons ?looks to be 1/8" to 1/4 size.
Not Dolomite, Label says crushed coral. That does mean it is calcium carbonate, but it has not been fossilized the way dolomite has been. Also, dolomite differs from coral and limestone in being higher in magnesium.
That bag is just crushed coral. Too alkaline for use as a major component of a potting media. It can be blended with acidic components, like composted bark, peat moss and other organics, blended to make a more neutral potting mix..
I would only use this material in my marine aquarium.