A Chromian Hydrogrossular from Jordanów, Lower Silesia, Poland

W. Heflik and W. Żabiński
Department of Mineralogy and Petrography, Academy of Mining and Metallurgy, Cracow, Poland

Summary: A new variety of garnet, a chromian hydrogrossular, has been found in a loose block of diopside-albite rock in a quarry of serpentinite in Jordanów, Lower Silesia. Its chemical formula is given. Although the water content of this garnet barely exceeds 1 %, the X-ray, thermal, infra-red spectrophotometric, and optical examinations give evidence that this water, in the form of (OH)4 groupings, substitutes for the SiO4 tetrahedra. The chromian hydrogrossular from Jordanów belongs to the numerous calcium-rich silicates that were formed there during the process of alteration of serpentinites by lime-rich hydrothermal solutions.

Mineralogical Magazine; June 1969 v. 37; no. 286; p. 241-243; DOI: 10.1180/minmag.1969.037.286.12
© 1969, The Mineralogical Society
Mineralogical Society (www.minersoc.org)