Moore, Paul B. Department of the Geophysical Sciences, University of Chicago, Chicago, Illinois.
Last reviewed:December 2019
- Additional Reading
A mineral, Ca2(Al,Fe3 +)(OH)2[Si3AlO10], with Al in parentheses in octahedral and Al in brackets in tetrahedral coordination by oxygens. The [Si3AlO10] tetrahedral sheet reflects its perfect platy cleavage. Owing to difficulty in securing suitable single crystals, the atomic arrangement of the mineral had not been known until recently. Prehnite crystallizes in the orthorhombic system, but various space groups have been assigned to it owing to Al-Si ordering, such as Pncm, P2cm and monoclinic (pseudo-orthorhombic) P2/n.
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