<HTML>Just to throw a little gasoline on this heated discussion.Around 1991 I read a pictorial essay in Texas Highways Magazine about an "agate ranch" in south central Texas which had acres of agate,the owner even built his house out of it.Anyway he was breaking off chunks of it to sell to the tourists when he found liquid silica pouring out of a large agate boulder.Within hours it had solidified into solid.Secondly,we have several mammoth skeletons here in Texas and the ones I have personally examined(teeth and tusk only)were completely fossilized.The teeth which have been found often along the North Sulphur River are brown/black silicaceous stone.The blue shale they are found in also contain shark teeth of the same material along with cretaceous fossil marine life.The different geological ages are all jumbled together in this mudstone which itself is in various stages of solidification.When someone quarries it for paving material it often reverts back to slippery clay when exposed to a few good rains.</HTML>