 ... decomposition of a feldspathic rock. Large and richly colored zircons, sometimes as much as 2 ounces in weight, and of fine shades of brown and honey-red, are found in Iredell County.'. Within the past 20 years some demand has arisen and continued...  History of the Gems Found in North Carolina - Seite 49von George Frederick Kunz - 1907 - 60 SeitenVollansicht - Über dieses Buch
 | George Frederick Kunz - 1890 - 416 Seiten
...the United States. So thorough and successful has this search been that many minerals which were then considered rare are now so plentiful that they are quoted at one-tenth to one-hundredth of their former prices. The best zircon locality in North Carolina is on the old Meredith... | |
 | 1895 - 516 Seiten
...demand has arisen and continued for minerals containing the rare earths,—zirconia, thoria, etc.,—as these substances are used for the mantles or hoods...so plentiful that they are quoted at one-tenth to one52 HISTORY OF THE GEMS FOUND IN NORTH CAROLINA. hundredth of their former prices. The best zircon... | |
 | North Carolina. Dept. of Conservation and Development, North Carolina. Division of Mineral Resources - 1907 - 120 Seiten
...20 years some demand has arisen and continued for minerals containing the rare earths, — zirconia, thoria, etc., — as these substances are used for...NC Geolog. Survey, Economic Paper, No. 6, 1001, p. 09 ; and Department of Mining Statistics, 1808, p. 34. hundredth of their former prices. The best zircon... | |
 | George Frederick Kunz - 1907 - 126 Seiten
...20 years some demand has arisen and continued for minerals containing the rare earths, — zirconia, thoria, etc., — as these substances are used for...to one• NC Geolog. Survey, Economic Paper, No. 6, 1901, p. 99 ; and Department of Mining Statistics, 1898, p. 34. hundredth of their former prices. The... | |
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