Edingtonite and natrolite from Ice River, British Columbia

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Authors:Grice, J. D.; Gault, R. A.
Author Affiliations:Primary:
Natl. Mus. Can., Natl. Mus. Nat. Sci., Ottawa, ON, Canada
Volume Title:Mineralogical Record
Source:The Mineralogical Record, 12(4), p.221-226. Publisher: Mineralogical Record, Inc., Tucson, AZ, United States. ISSN: 0026-4628
Publication Date:1981
Note:In English. 8 refs.; illus. incl. 2 tables, geol. sketch map
Summary:Edingtonite and natrolite crystals of exceptional quality have been found in the Ice River alkaline complex, approximately 25 km S of Field, British Columbia, Canada. Both species are almost at their end-member compositions with SiO2 36.3, Al2O3 20.6, BaO 28.6, K2O 0.32, H2O 12.8, = 98.62 for the edingtonite, and SiO2 47.17, Al2O3 26.84, Fe2O3 0.07, MgO 0.05, CaO 0.12, Na2O 15.89, K2O 0.02, H2O 9.58, = 99.74 for the natrolite. The edingtonite has D 2.72(1) g/cm3 with alpha 1.535, beta 1.542, gamma 1.545, 2V 10°-62°. Observed forms include (110), (111), (111), and (001), with some possible lamellar twinning on (110). Unit cell constants are a 9.583, b 9.624, c 6.527 A. The natrolite occurs as lustrous, water-clear crystals up to 16 cm showing (110), (100), (010), (111) , (311), (331), and 13 other forms. Twenty-five associated species are noted and briefly discussed. [G.W.R.]
Subjects:Alkalic composition; Chemical composition; Collecting; Crystal form; Edingtonite; Framework silicates; Intrusions; Mineral data; Mineral inventory; Mineralogy; Minerals; Natrolite; Optical properties; Popular geology; Silicates; Zeolite group; British Columbia; Canada; North America; Northern Rocky Mountains; Rocky Mountains; Western Canada; Ice River Complex; Kootenay National Park; Yoho National Park
Coordinates:N510000 N513000 W1160000 W1170000
Abstract Numbers:82M/1716
Record ID:1982003054
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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