A calcium magnesium silicate                                                                                            Hardness 4-5

Tremolite from the talc mines of Balmat and Talcville, New York is noted for its orange LW and SW fl. This material ranges in response from non-fl through various shades of orange, pink and red. Specimens with mixed fl colors are not unusual and are often quite attractive. A similar material has been reported from Ontario. Most tremolite fl a dull

gray-green or cream. It usually occurs as masses of needle crystals grown together.


Zirconium silicate                                                                                                          Hardness 7-71/2

Zircon often fl golden yellow to brown SW. Frequently identified in sands by its yellow fl. Fl zircons are found in the gem gravels of Burma and Ceylon. In the United States they are found in several localities in North Carolina. Many stubby fl crystals were found in a cotton field near Statesville, North Carolina. Night prospecting with a portable ultra- violet light was the most effective way of locating these crystals. Zircon

is the ore of the metal zirconium.


Fluorescent Color

GREEN


A basic arsenate of zinc                                                                                                     Hardness 3 1/2

The secondary zinc mineral adamite commonly occurs as drusy crystal coatings colored yellow, pale green or blue green. The best green fl is seen in the pale green material. Fl is normally best SW but sometimes also good LW. The outstanding locality for fl adamite is Mapimi,Durango, Mexico where it occurs as drusy crystals lining cavities in limonite.


Calcium carbonate                                                                                                         Hardness 31/2-4

Aragonite will sometimes fl green as a result of uranium activation. It is not unusual for the tips only of coral-like aragonite growths to fl green SW. Fl LW is usually weaker or else absent.



Aragonite with green fl has been found at Organ, New Mexico, at Bird cave near Tres Hermanos, New Mexico and at Santa Eulalia, Chih., Mexico. Magnificent fl specimens consisting of aragonite crystallizations rendered fl by the inclusion of the rare uranium mineral Novacekite have been found at Placeres de Guadalupe, Chih., Mexico.


A hydrated phosphate of calcium and uranium                                                          Hardness 2-2 1/2

The most common fl uranium mineral is autunite which occurs widely in the pegmatites of New England and Mitchell Co., North Carolina. It is also found at Bedford, New York, near Keystone, South Dakota and at the White Signal district. Grant Co., New Mexico. Autunite is usually found as small nearly square crystal platelets, pale yellow or green in color. Magnificent specimens of cockscomb crystal aggregates have been found at the Daybreak Mine Spokane Co., Washington. Other outstanding localities for autunite include Autun, France, for which the mineral is named, Cornwall, England, Katanga district Africa and Mt. Painter, South Australia.


DIAMOND

Gem diamonds have been found which fl various shades of green.

See diamond in the "blue section


Hydrous silica                                                                                                            Hardness 51/2-61/2

The hyalite variety of opal often has sufficient uranium content to fl a brilliant green SW and sometimes a lesser green LW. Hyalite occurs as a thin transparent coating or as a stalactic crust. Seams of hyalite are very common coating fractures in pegmatites and granites. They account for most of the common green fl seen in the pegmatites of New England and North Carolina and also in the nepheline deposits of Ontario. These thin, often invisible, coatings will usually react with a brilliant green fl SW. Outstanding fl hyalite crusts have been found in the feldspar and mica mines of Mitchell County, North Carolina. Beautiful crusts, often tinted blue or green have at times reached a thickness of over I". More commonly  these coatings are 1/8" or less in thickness. Hyalite is also found as a smooth botryoidal coating in cavities in volcanic rocks.


Hydrous silica                                                                                                           Hardness 51/2-61/2

Common opal from several areas of the western United States will fl green because of a slight uranium activation. The outstanding locality is the Virgin Valley, Humbolt County, Nevada where large masses of fl common opal have been found. Fl is usually best SW although some reaction to LW is common.