 | Geological Survey (U.S.) - 1910 - 116 páginas
...that the spar lies in the loose, disintegrated material, and the vein walls are not clearly denned. The rock is a mica schist bordering on serpentine,...abundant in places and there is considerable diffused quartz, but no large masses were observed. A band of green serpentine occurs in one of the quarries,... | |
 | 1928 - 356 páginas
...Hopkins.-1 "Feldspar was quarried from four openings during the present season (1898) and there are not less than half a dozen other openings from which...abundant in places and there is considerable diffused quart/., but no large* masses were observed. A band of green serpentine occurs in one of the quarries,... | |
 | Arthur B. Campbell - 1960 - 334 páginas
...quarries are comparatively shallow * * *. The spar lies In the loose disintegrated [country rock] * • * and the vein walls are not clearly defined. The rock...abundant In places, and there is considerable diffused quartz but no large masses were observed. • * * Tourmaline crystals are reported. Detailed studies... | |
 | 1899 - 526 páginas
...few years. The openings are comparatively shallow, and appear rather as pockets than veins, although probably enlargements of veins, but the country rock...rock is a mica schist bordering on serpentine, and it appears that some of the quarries are within the serpentine area. Muscovite and biotite are quite... | |
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Feldspar was quarried from four openings during the present season (1898) and there are not less than half a dozen other openings from which spar has been removed within the last few years. The quarries are comparatively shallow and indicate an occurrence... 