. Bulletin - United States National Museum. Science. 272 BULLETIN 131, UNITED STATES NATIONAL MUSEUM mine small transparent crystals are found coating a lamellar quartz probably pseudomorphous after argentine clacite. All of these occur- rences demonstrate the aqueous origin of the mineral. Prof. L. V. Pirsson examined the crystals and found them to have the habit of adularia with the forms (110), (001), and (T01) as in crystals from St. Gothard in Switzerland. In the Idaho crystals, however, he found the base (001) usually very small and often wanting, the crys- tals then bounded only by (110
. Bulletin - United States National Museum. Science. 272 BULLETIN 131, UNITED STATES NATIONAL MUSEUM mine small transparent crystals are found coating a lamellar quartz probably pseudomorphous after argentine clacite. All of these occur- rences demonstrate the aqueous origin of the mineral. Prof. L. V. Pirsson examined the crystals and found them to have the habit of adularia with the forms (110), (001), and (T01) as in crystals from St. Gothard in Switzerland. In the Idaho crystals, however, he found the base (001) usually very small and often wanting, the crys- tals then bounded only by (110) and (T01) and having a strikingly rhombohedral aspect. This rhombohedral appearance is shown by the photographs of Plate 6 and the unwary mineralogist often pronounces the mineral calcite at a glance and specimens are found in collections labeled quartz pseudomorphous after dolomite, etc. The. 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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