Abstract
THE specimen of apatite represented in the diagram was submitted to my inspection by Mr. Henson last November, and is the most beautiful specimen of this mineral which I have seen. The faces observed were not, however, determined on the specimen itself, but from a plaster cast and a smaller specimen with which Mr. Henson supplied me. From these latter approximate measurements of some of the more prominent angles were obtained by means of a contact-goniometer, which, on comparison with the table of angles given in Miller's “Mineralogy,” rendered the identification of the more conspicuous planes easy. The remaining planes were then easily determined from the relation which connects three planes lying in a zone. The forms present are: o{III}' a{101}, r{100}, r1{221}, x{210},i{321}, ur{410}, u1π{223}.
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L., W. On A Fine Specimen of Apatite from Tyrol, Lately in The Possession of Mr. Samuel Henson . Nature 27, 608–609 (1883). https://doi.org/10.1038/027608a0
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DOI: https://doi.org/10.1038/027608a0
