Mineral Rock Dust is not just crushed rock as most people think but rather a carefully blended mix of minerals such as Basalt, Gypsum, Lignite & Rock Phosphate. There can be up to 100 different minerals present. Most are as exceedingly small amounts of trace elements and their use will create a reserve of these trace elements.
The common minerals supplied by Rock Minerals are Potassium, Calcium, & Magnesium. But this depends on the natural mix of the rocks that they are derived from & mixed with to form the commercial product. They may be in small amounts, but trace elements need to be in small amounts otherwise they become toxic to plants even though they are essential to plant (& human) health.
Some trace elements are:
• Manganese (Mn) It helps in the formation of chlorophyll
• Iron (Fe) Important in forming chlorophyll
• Boron (B) influential in the absorption of calcium
• Molybdenum (Mo) Important in Nitrogen Fixation (especially in Legumes)