Rockdust - Wikipedia
The igneous rocks basalt and granite often contain the highest mineral content, whereas limestone, considered inferior in this consideration, is often deficient in the majority of essential macro-compounds, trace elements, and micronutrients. Rock dust is not a fertilizer, for it lacks the qualifying levels of nitrogen, potassium, and phosphorus.Basalt rock dust as plant fertilizer - Designer Ecoystems,Basalt rock dust as a source of natural nutrients for plants Basalt is an igneous rock. That means it wasn’t processed or transformed by environment, so the plant nutrients in it, are just as they were when they came out of the center of the Earth.FAQs - Rock Dust Local,Q: Is Glacial Rock Dust Better than Single Geologic Sources like Basalt? A: Not necessarily. Over 30 years ago o ne of the founding fathers of remineralization, John Hamaker, promoted the use of glacial and alluvial rock dusts for remineralization.