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Post by Peruano on Jul 2, 2023 15:31:08 GMT -5
Without trying to hijack this thread from its original direction, this white "rind"/"crust" is quite common on agates and not just petrified wood here in New Mexico. In fact once you are tuned in to its unique white tone, its a great search image when hounding. Few other rocks will have such a white coating. Its not crusty like calcium deposits would be and its quite distinct from the coatings that occur on flints etc. I've always referred to it a crust or oxidized layer, but since we are talking about Silicon dioxide as the primary mineral that would not make much sense. Sometimes I leave traces of the white on the edges of cabs to give them more depth and character. I also realize that some of the features of pet wood end up with white coloration that is distinct from the surface crust I mention above. Some wood is entirely white or beige and some has major streaks internally as well as on the surface. Life is wonderful and thats why we always have to examine that rock !!!
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Post by 1dave on Jul 11, 2023 11:52:09 GMT -5
Groundwater carrying silica gel sometimes gathers clay particles - white, pink, brown - that fill layers.
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