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Originally Posted by nnjjohn
Glenn, is rock dust from slate yards? I pass plenty slate yards where I camp in the summer. Are similar amendments available in garden centers? tia
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nnjjohn, slate is a hard metamorphic rock originating from shale which is composed of very fine clay particles, so it weathers very slowly into very fine clay particles. Probably not a good idea if you already have sticky clay soils. Not much valuable mineral content there either other than calcium, magnesium and iron mostly I think.