and yellow Jasper, Chalcedony of every hue, the Topaz, the Onyx, the
Carnelian and every variety of Agate; no log or fragment is limited to
a single kind of gem. These different varieties of petrified wood are
made into ornaments, paperweights, inkwells, rulers, umbrella handles,
bowls, vases, etc.
Telluride of Gold and Silver. Tellurium 32.5%, Gold 25.5%, Silver 42%.
It occurs massive, fine granular to compact. Color steel-gray to
yag, Transylvania; in the United States at the Red Cloud Mine,
Boulder County, Colorado, and in California are the most important
points of occurrence.
Arseniate of Lime. Arsenic Pentoxide 53%, Lime 26%. It occurs in small
reniform and globular masses and has a silky luster. Color
snow-white or milk-white inclining to reddish or yellowish-white.
Found at Joachimsthal, Bohemia; in the Harz; and at Baden.
Ferric Arseniate. This mineral occurs principally in cubes. Color
olive-green passing into yellowish-brown, bordering sometimes upon
hyacinth-red and blackish-brown. It is associated with copper ores in
various mines in Cornwall; also in Australia, Saxony and Hungary.
Straw-yellow and pale green crystals occur at the Mammoth Mine, in Utah.
Orthosilicate. A rare mineral disposed in rhomboidal crystals and
greatly resembling quartz. It is colorless, wine-yellow, pale rose and
to subtranslucent. It occurs in the Ural Mountains, Switzerland, and
Ekaterinberg where the crystals are sometimes four inches across. It
is also found in New Hampshire and Colorado.
is one of the minerals which furnishes colorless stones. It is
comparatively soft, but because of the high index of refraction,
brilliant cut gems of this stone possess, to a degree, the luster and
fire of diamonds.
Calcium, Potassium, Alumino-Silicate. Many specimens contain also
Barium and Sodium. It occurs in crystals and in radially fibrous
globular aggregates. It is colorless, white, yellowish, grayish,
reddish or bluish. Minute crystalline aggregates and irregular
spherical groups have been found in deep sea dredging, from the bottom
of the Southern Pacific, south of the Sandwich Islands. It is also
found in transparent crystals in the masonry of the hot baths at