Siderite Epimorph after Calcite

A capturing pseudomorph (where one mineral that chemically replaces another mineral without changing the external form of the original mineral) of siderite replacing the original calcite. This replacement is an epimorph, where the later minerals formed over the top and then created a cast of the original crystal. 

.・。.・゜✭・.・✫・゜・。.
Stone roughly measures: 4" x 2.5"
(shapes and sizes may vary)
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