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Rock flour

Rock flour consists of finely ground volcanic rock and contains many minerals.

Also known as:
Mineral fines
Rock powders
Rock minerals

Rock flour or glacial flour consists of finely ground volcanic rock and contains many minerals. Rock flour is considered to be a soil conditioner and fertilizer, but Wageningen University & Research research cannot confirm this.
On the other hand, experiments with rock flour on sandy soils (heather, forest) because they are poor in minerals do seem to have a positive effect on the availability of minerals such as calcium, magnesium and potassium in the soil.
Rock dust is a waste product of quarries.

Ground limestone is used to make the soil less acidic – pH (acidity) is increased.

recognize ground limestone
Ground limestone (Garden lime) is used to prevent acidification of soils, photo: Rasbak - CC BY-SA 3.0