If your talking about that post on Barefoot, then just let MH have at them. If he does not approve of taking calcium supplements (except his own) or drinking well or spring water, because its like ingesting rocks; I'm sure he won't approve of the rock eating granny.
Sigh-I wish sandstone was good for you, I'm broke, out of food, and surrounded by rocks. I wonder how long I can fast on $6.00 worth of oranges?