- Greenstone Metabasalt originates from basalt subjected to great heat and pressure over millions of years
- Naturally green color distinguishes it from unaltered basalts and comes from the presence of various minerals that were formed by these metamorphic forces
- Excellent source of the valuable plant nutrients calcium, magnesium and iron
- Can be used for fortifying garden soils with these important mineral elements
- Ideal for direct application to soils or combining with other natural fertilizers, composts and soil amendments
