![[nodule]](d216a.jpg) |
A mud ball dried, cracked, and solidified millions of years ago, forming this septarian nodule. Yellow calcite and brown aragonite crystallized from water seeping into the mud ball's cracks and created this pattern.
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A mud ball dried, cracked, and solidified millions of years ago, forming this septarian nodule. Yellow calcite and brown aragonite crystallized from water seeping into the mud ball's cracks and created this pattern.
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