Bornite: A Sulphide of Copper and Iron, known as "Peacock Ore" because of its purple-red color. Bornite is an im-' portant ore of copper and is usually found associated with
other ores of copper. Sulphur 28.1%, Copper 55.5%, Iron 16.4%. It
is found in Cornwall, near Redruth, in Tuscany, Germany, Norway,
Sweden, Hungary, Bolivia, Peru and Mexico. In the U. S. in Connecticut,
Massachusetts, New Jersey and Pennsylvania. Some ancient Roman copper
coins found in the waters of a warm spring in France, had been partly
changed back into Bornite.
Bournonite: Ortho
Sulpho-Salts. This is a comparatively rare mineral and occurs either in
compact or granular masses, or well-developed crystals of steel-gray
color and brilliant luster. It contains Copper 13%, Sulphur 19.8%,
Antimony 24.7% and Lead 42.5%. It is only of economic importance as it
is mixed with other copper compounds. On long exposure to weather, this
mineral alters to Cerussite or Malachite and Azurite. It is found in
Bohemia, Hungary, Chile, Ontario and in the U. S. in Arizona, Arkansas
and Colorado.
Braunite: Oxide
of Manganese. Occurs massive arid in crystals; color dark
brownish-black to steel gray. It occurs in veins traversing Porphyry,
in Thurginia, Harz, Piedmont and Norway. Named after Herr Braun of
Gotha.
Breithaupite: Antimonial
Nickel. Antimony 67.2%, Nickel 32.8%. This is a rare mineral of a light
copper-red color, much brighter than Niccolite, its associate mineral.
Its crystals are hexagonal tables, and it usually occurs in dendritic
groups, in foliated aggregates and in dense masses. It is found in
Harz, Sardinia and Cobalt, Ontario.
Brochantite: A
Basic Sulphate of Copper. Sulphur Trioxide 17.7%, Cupric Oxide 70.3%,
Water 12% It occurs in groups of small prismatic crystals, in fibrous
masses and in drusy crusts, emerald-green to blackish-green in color,
and transparent or translucent. It is found in Cumberland, the Urals,
in Iceland, Mexico and Australia. In the U. S. in Colorado, Utah and
Arizona.
Broggerite: A
rare mineral of the nature of Uraninite or Pitchblende and is one of
the minor sources of radium. The gas Helium has also been obtained from
it.
Brookite: Titanium
Dioxide. Occurs only in crystals, orthorhom-bic in form with
composition similar to Rutile. The crystals are opaque, translucent or
transparent with
color varying from yellowish-brown to brownish-red. Fine Brookite
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