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The halotrichite group: the crystal structure of apjohnite

Published online by Cambridge University Press:  05 July 2018

S. Menchetti  and
C. Sabelli
S. Menchetti
Affiliation:
Centro di Studio per la Mineralogia e la Geochimica dei Sedimenti, Istituto di Mineralogia dell'Università di Firenze, Italy
C. Sabelli
Affiliation:
Centro di Studio per la Mineralogia e la Geochimica dei Sedimenti, Istituto di Mineralogia dell'Università di Firenze, Italy
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Summary

Apjohnite, MnAl2(SO4)4·22H2O, is monoclinic, space group P21/c, a 6·198 (2), b 24·347 (4), c 21·266 (4) Å, β 100·28 (3)° and Z = 4. The crystal structure was determined by means of direct methods applied to X-ray data collected with a single-crystal diffractometer. At the end of the refinement, performed with least-squares method, the R index was 0·039.

The SO4 tetrahedra, Al(H2O)5 octahedra, and MnO(H2O)5 octahedra are connected by a hydrogen bonding system; the only direct connection between polyhedra is by sharing of an oxygen between S(4) and Mn. In the asymmetric unit there are twenty-two water molecules, five of which lie in channels of the structure and are not linked to the cations but only to ligand water oxygens by means of hydrogen bonds.

Powder data indicate a close structural relationship between apjohnite, halotrichite, and pickeringite.

Type
Research Article
Information
Mineralogical Magazine , Volume 40 , Issue 314 , June 1976 , pp. 599 - 608
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1976

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