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American Mineralogist; November 2007; v. 92; no. 11-12; p. 1998-2001; DOI: 10.2138/am.2007.2581
© 2007 Mineralogical Society of America
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Re-examination of berlinite (AlPO4) from the Cioclovina Cave, Romania

Bogdan P. Onac1,2,* and Herta S. Effenberger3

1 Department of Geology, University of South Florida, 4202 E. Fowler Avenue, SCA 528, Tampa, Florida 33620, U.S.A.
2 Department of Mineralogy, Babes-Bolyai University/Speleological Institute, Clinicilor 5, 400006 Cluj, Romania
3 Institut für Mineralogie und Kristallographie, Universität Wien, Althanstrasse 14, A-1090 Wien, Austria

Correspondence: * E-mail: bonac{at}cas.usf.edu

Berlinite is a mineral indicative of high-temperature formation and, therefore, it would not be expected to be present in a sedimentary environment. In this study, we review the characteristics of a berlinite-bearing deposit and present a single-crystal structure investigation based on X-ray data: the refinement converged at R1(F) = 0.0276, wR2(F2) = 0.0657 for 677 reflections (2{theta}MoK{alpha} ≤70°) and 31 variables in space-group P3121 [a = 4.9458(10), c = 10.9526(20)Å, V = 232.0 Å3, Z = 3{AlPO4}]. The average <T-O> bond distances within the two crystallographically unique TO4 tetrahedra are 1.734 and 1.526 Å, respectively. From the scattering power at these T sites and the stereochemistry, the presence of an AlO4 tetrahedron linked to a PO4 tetrahedron is established. Consequently, the sample from Cioclovina Cave is verified as AlPO4 (modification berlinite), reconfirming the first description of this mineral from a sedimentary occurrence, which underwent an obvious natural heating process.

Key Words: Berlinite • Cioclovina Cave • Romania • cave minerals






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