Abstract
I HAVE to thank Mr. Woodward for pointing out that the plane (412) has been established for barytes. It was first given by Helmhacker (Denksch. der K. Akad. der Wiss. Wien. vol. xxxii. 1872) as occurring on crystals from Svárov and Kruná hora in Bohemia, but is rejected by Schrauf as insufficiently determined. The distinguishing peculiarities of the Chirbury crystals are (1) the predominance of the plane E which does not truncate an edge as is the case in Carl Urba's crystals; (2) the frequent occurrence of ω and ξ ; (3) the tendency of the face o to develop small faces on its edges which are inclined to o at angles near 3°. Such faces are Q and Y, and I have since determined a face Δ on the edge oμ with indices near (25.1.27).
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MIERS, H. Barytes from Chirbury. Nature 29, 124 (1883). https://doi.org/10.1038/029124a0
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DOI: https://doi.org/10.1038/029124a0
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