Vermiculite

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1. A clay mineral sometimes used as an amendment for sand-based soils which is noted for its high nutrient holding capacity and low shrink/swell capacity.

vermiculite.jpg

Vermiculite for horticultural use.
Source: http://www.extension.umn.edu/yardandgarden/YGLNews/YGLN-Apr0100.html

Vermiculite.jpg

A magnified look at vermiculite.
Source: http://www.mii.org/Minerals/photovermiculite.html