Basalt Rock Dust for remineralization. Fresh crush. Paramagnetic. Premium quality volcanic rock dust pulverized for use in broadfield applications, for fruit and vegetables, grains, forestry, compost, potting mix and soil blends. Provides essential elements and micronutrients. Suggested use: broadcasted 5-40 lbs./ square feet incorporated, 5-25 lbs. top dressing. For composting, add 25 lbs./ cubic yard raw biomass or up to 50 lbs. to finished compost. Mixing with potting soil, 5-10% by volume. Certifiable for organic production using USDA/NOP standards. One of the nation's BEST rock dusts by Rock Dust Local standards. One box contains 40 lbs.