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Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc.

Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc. Page of 364 Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc. Text size:minus plus Restore normal size   Mail page  Print this page
UNITED STATES, CANADA AND MEXICO                       145
lowing results: Nos. 1-3 were slabs 2 millimeters thick (1/12 inch), No. 4 was a natural lump with glazed coating. This stone is iden­tical with one brought from China, several centuries ago, and de­scribed by De Boot, DeLaet, Boyle, and others, as the Oculus Mundi, or World's Eye, and as the Lapis Mutabilis. When wet, it became entirely transparent, except a central nucleus, possibly a core of chalcedony, that remained white. If the central core was black, evidently oxide of manganese, the stone was called Oculus Beli. Hoffmann mentions opalized wood in magnificent colors at San Antonio, Nye County, Nev., and states that on breaking some of the large trunks fine specimens were obtained. Fine large sections of trees altered to wood opal are found at Buena Vista, Col. The color varies from white to brown, and the structure of the wood is preserved. In the hydraulic mines of California,
and at Murphey's in the same State, large and very beautiful masses of opalized wood, of fine brown, yellow, and black colors, have frequently been found.
Hyalite, or Muller's Glass, as it is called, occurs on the trap-rock at Weehawken and Orange, N. J.; with chalcedony at sev­eral localities in Yavapai County, Ariz.; at the Philips ore bed, Putnam County; with cachalong at Bellvale, Orange County, N. Y.; in Burke County, N. C, and Screven County, Ga.; in yel­low fluorescent coating upon gneiss at Frankford, Pa.; at Avon-dale, Delaware County, Pa., in bluish-green; on the Wissa-hickon River in Pennsylvania ; at Concord, Cabarrus County, and at the Culsagee Mine, Macon County, N. C. Associ­ated with semi-opal, it is mentioned as occurring in the Mount Diablo Range about thirty miles south of Mount Diablo. It has also been found at Volcano Pass, Larimer County, Col. At none of these places, however, is it found in masses thick enough to af­ford even a mineralogical gem, and commercially it has no value.
During the survey of the Yellowstone National Park, in 1872, by Dr. Ferdinand V. Hayden, United States Geologist, a large
Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc. Page of 364 Ch. 7: Quartz Group - Opal, Rock Crystals, Amethysts, Rose Quartz, Agate, etc.
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