Down to Earth 07804 6 Lb All Natural Azomite Trace Minerals Powder 0-0-0.2 Slow Release Powder (0-0-0.2) Volcanic Dust Contain over 60 Trace Minerals Particle Sizes range from 4 to 200 mesh Ideal for blending with other fertilizers Economical way to re-mineralize soils, composts, potting mediums