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Mineralogical ClassificationMotukoreaite from the Klodawa Salt Dome, Central Poland

5th May 2016 18:27 UTCMarco E. Ciriotti Manager

Reference:

▪ Wachowiak, J. & Pieczka, A. (2016): Motukoreaite from the Klodawa Salt Dome, Central Poland. Mineralogical Magazine, 80, 277-289.

Abstract:

Motukoreaite, Mg6Al3(OH)18[Na(H2O)6][SO4]2·6H2O, is a poorly-known, rare layered double hydroxide mineral belonging to the wermlandite group in the hydrotalcite supergroup. It was found in abundant quantities (at least hundreds of thousands Mt) in the roof part the Younger Potash unit of the Leine cyclothem on the Klodawa Salt Dome in central Poland (Permian–Mesozoic basin of Central Europe), outside its known typical environments like altered basalts and basaltic tuffs, including those deposited in submarine volcanic areas. The mineral displays varying SO42–, Na+ and H2O contents with negligible CO32–, corresponding to the mean composition Mg5.75(Al3.20Fe3+0.04)3.25(OH)18.00{[Na(H2O)6]0.72□0.28}[(SO4)1.67(CO3)0.03(OH)0.57]·0.72H2O. It can be related to the partly dehydrated, hypothetical end-member Mg6Al3(OH)18[Na(H2O)6][(SO4)2]·6H2O. The Klodawa motukoreaite represents the hexagonal, 3-layer polytype with the 3 × 3 superstructure in the xy plane, and unit cell a = b = 9.191(2)–9.199(2) Å, i.e. = 3 × 3.064–3.066 Å and c = 33.529(9)– 33.562(7) Å, i.e. = 3 × 11.174–11.187 Å. The mineral was formed by alteration of clays delivered to the basin by an aeolian overprint and co-sedimented along with the evaporite sequence, initiated under the influence of Mg2+- and SO4 2–-bearing brines at temperatures not exceeding 160–200oC, released from the evaporites during diagenetic/metamorphic processes.

6th May 2016 12:04 UTCAlfredo Petrov Manager

It's funny how a relatively rare species can suddenly become extraordinarily abundant. I had the same feeling when the great bed of chambersite was discovered in China.

6th May 2016 20:27 UTCŁukasz Kruszewski Expert

Yes, this is quite interesting ...

6th May 2016 21:03 UTCŁukasz Kruszewski Expert

Thank you for adding, Marco. I've introduced some data into the Kłodawa site.

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