Image: CalciteEchinosphaerites
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Description: Calcite crystals inside a test of the cystoid Echinosphaerites aurantium (Middle Ordovician, Estonia).
Title: CalciteEchinosphaerites
Credit: Own work
Author: Mark A. Wilson (Department of Geology, The College of Wooster).[1]
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
Image usage
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