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The relation of stellerite and epidesmine to stilbite1

Published online by Cambridge University Press:  14 March 2018

Adolf Pabst
Adolf Pabst*
Affiliation:
University of California
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Extract

The recent finding of a stellerite-like mineral in California has led to this study of its relations to epidesmine and stilbite. The mineral was found by Mr. Allen Nichol, mineralogist of the Division of Highways, in the quarry of the Calavera Materials Company near Oceanside, San Diego County. Some specimens reached the writer through the State Division of Mines. The mineral occurs as sheaf-like clusters of small glistening white crystals in cracks and cavities of andesite. The largest crystals are nearly a quarter of an inch long, but tend to aggregate formation so that they do not lend themselves to accurate goniometric measurement. They are apparently orthorhombic, of tabular habit, showing the three pinakoids and small bright faces of a pyramid. The excellent pinakoid cleavage has a pearly lustre, and if this is taken as (010) the crystals, which show parallel extinction, have the same optical orientation as stellerite.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 25 , Issue 164 , March 1939 , pp. 271 - 276
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1939

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Footnotes

1

Work done in the Mineral Department of the British Museum during leave of absence as Fellow of the John Simon Guggenheim Memorial Foundation.

References

page 271 note 2 Morozewicz, J., Über Stellerit, ein neues Zeolithmineral. Bull. Intern. Acad. Sci. Cracovie, Cl. Sci. Math. Nat., 1909, 2me semestre, pp. 344–359.Google Scholar

page 271 note 3 Wheeler, E. P., Stellerite from near Juneau, Alaska. Amer. Min., 1927, vol. 12, pp. 360–364. [M.A. 4–325.]Google Scholar

page 272 note 1 Rosieký, V. and Thugutt, S. J., Epidesmin, ein neuer Zeolith. Centralbl. Min., 1913, pp. 422–426 Google Scholar.

page 272 note 2 Shannon, E. V., The mineralogy and petrology of intrusive Triassic diabase at Goose Creek, Loudoun County, Virginia. Prec. U.S. Nat. Mus., 1924, vol. 66, art. 2, p. 72. [M.A. 3–204.]Google Scholar

page 272 note 3 Goldschmidt, V., Krystallographische Winkeltabellen, 1897, p. 118.Google Scholar

page 272 note 4 Sekanina, J. and Wyart, J., Sur la stilbite. Bull. Soc. Franç. Min., 1936, vol 59, pp. 377–383. [M.A. 6–525.]Google Scholar

page 272 note 5 As quoted by Dana, , System of mineralogy, 6th ed., 1892, p. 583, and in Dana, Textbook of mineralogy, 4th ed., 1932, p. 648.Google Scholar