It can be used as agricultural lime but may not react as rapidly as lime specifically ground for adding to the soil. The large size of these particles prevent any meaningful soil reaction. This refers to the major compounds found in the original rock. Limestone rock is either calcitic or dolomitic. Calcite is a calcium compound.
Calcitic lime is mostly calcium.
Dolomite rock contains at least 6 percent Magnesium oxide. So dolomitic lime contains calcium and magnesium. You normally use dolomitic lime on sandy soils. Sandy soils don't have any way to hold magnesium or calcium. Both are needed for plant growth and should be added regularly.