"The holes look like natural solution cavities, where more soluble minerals, such as calcite, are dissolved out before the more resistant surrounding material." Norman http://rockpiles.blogspot.com/
The holes look like natural solution cavities, where more soluble minerals, such as calcite, are dissolved out before the more resistant surrounding material.
The holes look like natural solution cavities, where more soluble minerals, such as calcite, are dissolved out before the more resistant surrounding material.
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