one4 might be right - only in the stans. had my geologist look at it. he said 'really weird'. looks like a whole matrix of small geodes embedded in a fine grain matrix of something. stansburies are quartzite up high, limestone down low. the rock looks like it has a lot of silica matrix to it... but for a positive he needs to hold it and feel it and have some size estimates and this and that. so, drop a piece by the office.
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