Small Black Lava Rock it's only approved for organic

it's only approved for organic use and will NOT come from an organic source

A Note on Rock Types: While various rock types can be used for remineralization

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It is not necessary once the product is diluted to a solution

Small Black Lava Rock it's only approved for organicBeautiful Small Black Lava Rock looks like small medium perlite and is much better. This small black lava rock comes with black lava rock powder in it and will add to the minerals in your soil Last longer than perlite, works like perlite, and provides minerals. Lava Rock will not shift and float to the top of your container like perlite.