The glaciers descend, grinding up all rocks and mountains in their path, remineralizing the soil. When the forests again take root, they absorb the carbon from the atmosphere through photosynthesis, and the ice age diminishes. The amount of minerals and the quality rock used to produce rock dust depends on the location of the quarry, and the mining process. Many companies sell rock dust, but it is best to inquire about what minerals it contains and if there are any chemicals added. If their manufacturing plant is nearby, ask to take a tour.
Some companies simply sell the dust that is left over from manufacturing other products.
This may not have the necessary minerals for plants and trees, so it is best to buy rock dust from those companies which make it specifically for this use. They will be happy to provide a lab report for you. For best results mix different sources of rock dust together to get more complete trace minerals. There are many companies now offering rock dust. We have listed as many of them as possible in our Resource Directory that are our IGA members.