It happens but its a mess.
Some Southern states regulate what can be labeled "dolomitic limestone" and each state is different. Some require more than 30% magnesium, some less than 20%. What happens is "dolomitic limestone" often carries a hefty premium over the exact same thing labeled "magnesium carbonite". To make it worse, Organic Gardening touted "dolomitic limestone" years ago and it's become the gold standard for liming agents when the fact is some soils in the northeast (mine in particular) have too much magnesium. A lot of people pay too much because of these labeling laws.On the other hand, commerical growers in the south where soils are often lacking in magnesium, do need to know if the "dolomitic limestone" they are buying is 15% Mg or 36% Mg.
Re #116:
My FRiend all I can say is that when I need an expert on “dolomitic limestone” I’m going to come to you first. :)