is found in the copper mines in France; the Tintic District, Utah, and in Morenci Arizona.
Cyprusite: A
Hydrous Ferric Sulphate. An aggregation of microscopic crystals with
hexagonal cross-sections. Soft and chalk-like. Color yellowish; in
powder, intense
sulphur-yellow. It occurs in veins of considerable magnitude on the
Island of Cyprus, from which it is named. The mineral incloses
great quantities of the siliceous shells of Radiolaria.
Danburite: Calcium
Borosilicate. A comparatively rare mineral, resembling Topaz,
crystallizing in the orthorhombic system. When fresh and pure, it is
transparent, colorless, wine-yellow or yellowish-white; when impure, it
is honey-yellow to dark brown. Its original occurrence was at Danbury,
Connecticut, from which it takes its name, but was later found in
Russell, New York, on the walls of rocks and hollows in granite. Its
principal foreign occurrence is in Switzerland.
Datolite: Siliceous
Borate of Lime. This mineral occurs globular, in radiating, granular
and massive forms, also in fine crystals that are often very
complicated, 115 different forms having been observed on them. It is
colorless or white, when pure; sometimes greenish, yellow or reddish
and violet, and translucent. It is found in the Harz Mts., in Alsace,
Tyrol, Norway and Tuscany. In the United States at Deerfield, Mass., in
Connecticut, at Bergen Hill, N. J., and in the copper districts in
Michigan.
Descloizite: This
mineral belongs to the Olivenite groupe of Arsenates. It occurs in
crystals, usually small, short prismatic, also in stalactitic
aggregates, fibrous and
massive. Color columbine or cherry-red, chestnut-brown or black.
Transparent to nearly opaque. It contains lead, zinc, and sometimes
copper. Occurs in Argentine. Carinthia, and in the United States,
in New Mexico, Arizona and Montana.
Diamond: Pure Carbon, the hardest known substance. It is 140 times
harder than corundum, the next hardest mineral, and 1,000 times harder
than quartz. It is usually found in distinct crystals varying in size
from a pin's head to a robin's egg, though many larger ones have been
found. The largest ever found, known as the Cullinan Diamond, weighed
3024-3/4 carats. It was found in the Transvaal, January, 1905, and was
presented to King Edward of England as a birthday gift, but was later
divided, and cut into nine fine gems, the largest of which is the
largest diamond in the world, its weight being 516-1/2 carats. This
wonderful
