Sand for potting mixes
penstemon (Sat, 15 Nov 2014 14:43:20 PST)

Probably, but my guess is that saying "silica sand" is a hedge against
potential outrage from one or two customers who might have expected
aragonite and gotten silica sand instead.
I use sand (silica sand) to add weight to seed pots left outdoors, to
prevent them from being blown away, and pure sand to grow cactus seedlings
after initial germination in a regular mix (peat, perlite, sand, calcined
clay, whatever).
And I never use turkey grit without tasting it first ....

Bob