. Bulletin - United States National Museum. Science. 350 BULLETIN 131, UNITED STATES NATIONAL MUSEUM ADAMS COUNTY Associated with chabazite and stilbite on a specimen of massive brown garnet rock from the Blue Jacket claim in the Seven Devils district are a few minute crystals of a zeolite which is probably heulandite. This mineral under the microscope shows an apparently six sided form and is strongly zoned in layers parallel to its outline and also shows some division into irregular sectors. The appearance of one of the crystals between crossed nicols is indicated in Figure 113. All sections
. Bulletin - United States National Museum. Science. 350 BULLETIN 131, UNITED STATES NATIONAL MUSEUM ADAMS COUNTY Associated with chabazite and stilbite on a specimen of massive brown garnet rock from the Blue Jacket claim in the Seven Devils district are a few minute crystals of a zeolite which is probably heulandite. This mineral under the microscope shows an apparently six sided form and is strongly zoned in layers parallel to its outline and also shows some division into irregular sectors. The appearance of one of the crystals between crossed nicols is indicated in Figure 113. All sections lie on a perfect cleavage which is perpendicular to the acute bisectrix and such sections show a good interference figure which is biaxial positive with 2V medium. The /3 index of refraction aver-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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