Bulletin - United States Geological Survey Volume 490

9781231041376: Bulletin - United States Geological Survey Volume 490
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 Excerpt: ... as follows: Measurements of new form h 887. Measured. Calculated. 0=53 41' =53 43' p=57 31' io=5720/ A very narrow face vicinal to (TT2) was also observed. The form g 211, described as new by Ford, is present on this crystal as two large dull uneven faces. The form is probably characteristic of this locality, as it was seen on a number of other crystals. FORM SYSTEM OF NEPTUNITE. As the number of forms for neptunite has considerably increased since the original description of the mineral in 1893, a compilation of all the described forms with the coordinate angles thereto is given below. As in a similar table appearing in this paper a reference to the description on which the form is based is given, unless the form has been three times independently described. The values $ and p for the forms not given in Goldschmidt's Winkeltabellen have, except for ft 887, been taken from the table furnished by Hlawatsch.1 1 Hlawatsch, C, Bemerkungen zum Aragonit von Rohitsch, Natrolith und Neptunit von San Benito: Min. pet. Mitt., vol. 28,1909, p. 293. 1. Flink, G., Beschreibung eines neuen Mineralfundes aus Gronland: Zeitschr. Kryst. Min., vol. 23, 1894, p. 346. 2. Flink, G., Boggild, O. B., and Winter, C, Untersuchungen iiber Mineralien von Julianehaab: Meddelelser om Gr0nland, vol. 24, 1899. 3. Hlawatsch, C, Bemerkung zum Aragonit von Rohitsch, Natrolith und Neptunit von San Benito: Min. pet. Mitt., vol. 28, 1909, p. 293. 4. Louderback, G. D., and Blasdale, W. C, Benitoite, its paragenesis and mode of occurrence: Bull. Dept. Geology Univ. California, vol. 5, 1909, p. 331. 5. The present paper. ORBICULAR GABBRO FROM PALA, SAN DIEGO COUNTY, CALIFORNIA. A large number, a hundred or more, of what seemed concretions, were found lying loose on the summit of Hiriart Hill, ne...

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