. Bulletin - United States National Museum. Science. 109 110 Figs. 109-112.—Heulandite. Ill 112 From Challis, Custer County ges about , although different zones vary considerably. The angles between the edges marked 1, 2, and 3, in Figure 113 were measured under the microscope and gave: 1A 2 = 65° which corre- sponds to c(001) A 2(101) =63° 40' and 2 A 3 = 49° which cor- responds to lS0°-t A s(129° 40') =50° 20', so that 1 is probably c(001), 2 is 2(101), and 3 is s(101). This makes the trace of the axial plane parallel to c(001) as contrasted with the heulandite from Custer County describ
. Bulletin - United States National Museum. Science. 109 110 Figs. 109-112.—Heulandite. Ill 112 From Challis, Custer County ges about , although different zones vary considerably. The angles between the edges marked 1, 2, and 3, in Figure 113 were measured under the microscope and gave: 1A 2 = 65° which corre- sponds to c(001) A 2(101) =63° 40' and 2 A 3 = 49° which cor- responds to lS0°-t A s(129° 40') =50° 20', so that 1 is probably c(001), 2 is 2(101), and 3 is s(101). This makes the trace of the axial plane parallel to c(001) as contrasted with the heulandite from Custer County described below in which the optic plane is approxi- mately parallel to one of the domes, either s or t. CUSTER COUNTY The occurrence and properties of heulandite associated with mordenite and other minerals near Challis have been fully described. 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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