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What is the difference between Septarium and Septarian?

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what is the difference between Septarium and Septarian.  We found some brown stones with white fissures in west michigan that look like Septarium....but Septarian looks very similar.   Thanks.
asked Jan 11, 2016 by Bob Drnek (120 points)

1 Answer

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Septarium is a calcite filled concretion.

Sectarian is a calcite filled nodule that formed during volcanic activity where the calcite chemically bonded with Dead Sea minerals. The brown is aragonite and the grey is limestone.

If you found it in west Michigan it is Septarium. Congrats and post a picture please.
answered Jan 12, 2016 by Weasel (58,240 points)