ORANGE, YELLOW, GOLD

A calcium phosphate containing fluorine and manganese                                                  Hardness 5

Blue-green to white in daylight, manganapatite fl buff-brown to bright golden yellow SW. It is common in the pegmatites of New England and North Carolina. Excellent specimens have been found in the Portland, Connecticut area, often in association with green fl hyalite or autunite. It usually occurs in scattered grains in feldspar. The lighter colored material seems in general to fl more brilliantly.


A silicate of sodium and calcium with water of crystallization                                          Hardness 5


Pectolite usually occurs in fibrous masses. Specimens which fl bright yellow and cream have been found near the Golden Gate Bridge in California. Pectolite from some of the New Jersey trap rock quarries shows some fl and more often a gold ph when exposed to an unfiltered SW light.


A silicate of magnesium, potassium and aluminum                                                    Hardness 2-3

A magnesium mica, usually light brown in color, phlogopite will sometimes fl buff-yellow SW. Fl phlogopite has been found at Franklin, New Jersey and at Newcomb, New York.


A chlorocarbonate of lead                                                                                                   Hardness 2-3

Crystals of phosgenite which fl yellow have been found at Monteponi, Sardinia.


Calcium molybdate                                                                                                        Hardness 31/2-4

While its natural color varies from straw yellow and greenish yellow to gray, greenish blue and almost black, powellite is readily distinguished by its creamy or golden fl SW with no fl LW. Powellite is a secondary mineral usually formed by the alteration of

molybdenite. It has been found in the United States in the copper and tungsten mines of Adams, Beaver and Tooele counties in Utah; also associated with copper in the mines at Houghton County, Michigan; in Nevada at Tonopah and near Oak Springs, Nye County; at Barringer Hill, Llano County, Texas; in California at the tungsten mines of Inyo and

Kern Counties; in Arizona in Pima and Mohave Counties; also in New Mexico in Sierra County.


A complex silicate of calcium, sodium and aluminum                                                     Hardness 5-6

One of the most spectacular LW fl minerals is the yellow fl wernerite from the Grenville. Quebec area. The old original locality for this material produced a fibrous looking brilliantly fl material. The scapolite offered to the collectors in more recent years is more compact and varies in color from white to translucent greenish-yellow. The fl is a spectacular brilliant yellow. Fl wernerite has also been found at Manawaki. Quebec. While it is not often noticed, wernerite has a weak but longlived ph after exposure to either LW or SW.


Calcium Tungstate                                                                                                         Hardness 41/2-5

This important ore of tungsten fl blue-white when pure, but when it contains sufficient molybdenum the fl is yellow. A smaller molybdenum content causes a white fl. It is not unusual to find specimens of scheelite in which the fl varies from blue to yellow, sometimes a grain only a fraction of an inch across will show separate areas of blue, white and yellow fl. There are many important sources of scheelite in. California, Nevada, New Mexico and Idaho. Scheelite has also been mined in  Connecticut and South Carolina. The description of scheelite in the "blue" section gives further information.


A silicate of sodium and aluminum containing chlorine                                                 Hardness 5-6

Sodalite from Moultonboro, New Hampshire fl a golden brown LW. Fl sodalite is also found in a pegmatite on the Appalachian Trail at Beemerville. New Jersey.


Zinc sulfide                                                                                                                    Hardness 31/2-4

Sphalerite from a number of localities shows a strong orange or golden brown fl usually best in LW. It often has a lasting ph of the same color. Sphalerite is often thermoluminescent and triboluminescent also. Fluorescent Color


ORANGE, YELLOW, GOLD

Fl sphalerite from Tsumeb, South West Africa, was available for many years. Similar fl sphalerite has been found at Bonanza, Colorado and Bisbee, Arizona. Fl sphalerite has also been found in the zinc mines at Franklin and Ogdensburg, New Jersey. Bright yellow fl SW coatings of secondary sphalerite have been found at Broken Hills, New South Wales, Australia.


An oxychloride of mercury                                                                                               Hardness 21/2

A rare mercury mineral, named for its locality, the mercury mines of Terlingua, Texas. Terlinguaite is often seen as bright yellow fl spots (SW) associated with the well known blue fl and ph calcite of Terlingua.