. Bulletin - United States National Museum. Science. THE MINERALS OF IDAHO 309 contact-metamorphic copper deposit extending south from Dry Gulch in the Spring Mountain district. Ludwigite from this property is also described elsewhere in this volume. The specimen in question is a banded granular mass made up of about equal parts of granular magnetite and pale brown forsterite. There are small cavities in the forsterite lined with minute tabular forsterite crystals and later filled with calcite. These minute tabular crystals, when lying on the 010 face, give an optical interference figure indic
. Bulletin - United States National Museum. Science. THE MINERALS OF IDAHO 309 contact-metamorphic copper deposit extending south from Dry Gulch in the Spring Mountain district. Ludwigite from this property is also described elsewhere in this volume. The specimen in question is a banded granular mass made up of about equal parts of granular magnetite and pale brown forsterite. There are small cavities in the forsterite lined with minute tabular forsterite crystals and later filled with calcite. These minute tabular crystals, when lying on the 010 face, give an optical interference figure indicating the obtuse bisectrix perpendicular to this plane. 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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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
