Celestite: Strontium
Sulphate. Sulphur 43.6%, Strontia 56.4%. It occurs in tabular,
prismatic crystals, in fibrous, and sometimes, globular masses. Though
usually white, it often has a bluish tinge to which it owes its name.
It occurs in beds with rock salt and gypsum in Switzerland, associated
with sulphur at Girgenti, Sicily, and in limestone at Strontian Island,
Lake Erie. Although this mineral occurs at several places in the United
States and Canada, it is not mined. As a source of strontium, Celestite
is much used in the manufacture of fireworks to give the red-colored
pyrotechnic display. It is also used in medicines, and in refining
sugar.
Cerargyrite: Silver
Chloride. Silver 75.3%, Chlorine 24.7%. Sometimes called "Horn Silver,"
probably on account of the Greek derivation of the name. It is an
important ore of silver and is usually associated with other silver
compounds. Is white when fresh, changing to brown when exposed to
light. Usually massive and resembling wax, sometimes columnar and often
in crusts. It is found in Peru, Chile, Honduras and Mexico. Also
Leadville, Colorado, Nevada, Idaho and Utah.
Cerussite: Lead
Carbonate. Lead Oxide 83.5%, Carbon Dioxide 16.5%. Generally occurs in
crystals, in granular, earthy and fibrous masses of white color, though
sometimes tinged blue or green by some of the salts of copper. It is
an important ore of Lead, and is mined with other lead compounds as an
ore of that metal. It is the principal ore of the great so-called
carbonate groups of Leadville, Colorado and Patagonia, Arizona, and is
used in a direct process for the production of white lead for paint.
Chabazite: Hydrated
Silicate. Composition uncertain. It occurs in crystals of a cubical
habit, also in compact aggregates, is colorless or white, yellowish or
pink. It occurs in volcanic rocks, on walls of crevices, and as a
deposit from thermal springs. It is found in Prussia, Silesia, Bohemia,
Tyrol, Italy, Iceland, Nova Scotia, and in the United States at
Paterson, N. J., in Maryland and Colorado.
Chalcanthite: Hydrous
Cupric Sulphate. Sulphur 32.1 %, Cupric Oxide 31.8%. A rare mineral
occurring near copper mines, in crystals, also massive stalactitic,
reniform and sometimes fibrous. Color Berlin-blue to sky-blue of the
different shades, sometimes a little greenish. It is used in printing
calico and in galvanic cells. Found in Sweden, Harz, Spain, in Uruguay,
Tennessee, Georgia, Arizona and Montana.
