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jda · 01/03/2018, 06:35 PM

It is probably the composition of the rock from where they were terrestrially collected.

Super low PH can also make rock brittle, but we are talking about in the 6.X range.

01/03/2018, 06:35 PM	#6
jda Dogmatic Dinosaur Join Date: Feb 2004 Location: Boulder, CO Posts: 6,256	It is probably the composition of the rock from where they were terrestrially collected. Super low PH can also make rock brittle, but we are talking about in the 6.X range.