. Bulletin - United States National Museum. Science. cent and steel-gray in color with metallic luster from thin outer coatings of manganese oxide. Other pure white masses of crystals were crusted with dendritic wires and moss-like masses of native silver. Some specimens, yellow from a thin outer coating of limonite, were made up of small model per- fect six-rayed penetration twins. Workings of the Bunker Hill Co., penetrating the oxidized portion of the Tyler vein from below about this time disclosed fine cerusite, par- ticularly in the Barney stope. Two stalactitic masses having a large botr
. Bulletin - United States National Museum. Science. cent and steel-gray in color with metallic luster from thin outer coatings of manganese oxide. Other pure white masses of crystals were crusted with dendritic wires and moss-like masses of native silver. Some specimens, yellow from a thin outer coating of limonite, were made up of small model per- fect six-rayed penetration twins. Workings of the Bunker Hill Co., penetrating the oxidized portion of the Tyler vein from below about this time disclosed fine cerusite, par- ticularly in the Barney stope. Two stalactitic masses having a large botryoidal form were taken from this stope in 1915. These weighed nearly 100 pounds, were coated out- side with limonite, but inside they consisted of pure white cerusite of fibrous structure. These were em- bedded in the concrete of the bridge crossing the flume on McKinley Ave- nue in the town of Kellogg. A large specimen of fibrous cerusite from this stope which laid for some years on the floor of a storeroom of the old Bunker Hill office at Kellogg con- tained included unoxidized masses of resinous brown sphalerite. The Caledonia mine, opened through a shaft to the 300 and 500 foot levels, west of Wardner and on the east of Deadwood Gulch, in 1910 developed a rich body of carbonate ore and produced much cerusite prior to 1915 and yielded many excellent specimens, but much of the cerusite was massive and the yield of fine specimens was much smaller, in proportion, than in some fig. 62. other mines of the district. Some small clear glassy crystals were al- ways to be obtained and a few large glassy twins in considerable aggregates were obtained embedded in clayey gouge. The usual columnar and " taffy-like" fibrous white specimens were obtained, sometimes colored green by an outer layer of malachite. Some small colorless to slightly smoky crystals obtained from cavities. Cerusite. Characteristic group twinned on to(110). mammoth mine, Mace, Shoshone County. Please note t
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