A Rock Dust Local of great fortitude. All purpose "grits-to-dust" for adding minerals to growing media and sweeting soils. Builds mineral structure and adds carbon. A sedimentary clay mineral complex of high nutritive content including Nitrogen, Phosphorus, Potassium, Silicon, Calcium, Magnesium, Iron, Sulphur and significant traces including Vanadium, Zinc, Cobalt, Chromium, Copper, Molybdenum and Boron. Includes nearly 5% total carbon, 1% organic carbon and .1% total nitrogen. Suggested application rates: Between 5-25 lbs./100 square feet, up to 50 lbs./ 100 square feet. This material has alkaline earth elements which will tend to buffer acidic soils as the material weathers.