a. Replaces the generally accepted name sphaerocobaltite for rhombohedral
CoCO3 . Not the cobaltocalcite of F. Millosevich, 1910, a red
cobaltiferous variety of calcite. Spencer, 4
b. A former name for sphaerocobaltite.
See:erythrite; asbolan; asbolane.
A peach-blossom-red rhombohedral variety of siderite with moderate
substitution of cobalt for iron. Also spelled cobaltospharosiderite.
An isometric mineral, Co9 S8 ; pentlandite group.
a. See:linnaeite
b. Cobaltiferous pyrite containing up to 14% cobalt; an ore of cobalt in
Zambia.
An authigenic deposit of iron-manganese oxides enriched with cobalt. These
crusts may contain potentially commercial quantities of manganese (20% to
30%), copper, nickel, and cobalt (less than 3% combined), but are
primarily evaluated on the basis of their cobalt content. They are found
as encrustations on exposed rocky seabeds on island slopes, seamounts, or
submerged plateaus in water depths between 800 m and 2,400 m. The crusts
may be up to 40 cm thick, but are more commonly 3 to 5 cm. They often
occur in association with platinum and phosphorite.
The pure end member, CoAs3 , of the skutterudite series.
Syn:skutterudite
See:bieberite; rose vitriol.
Eng. Ore broken from veinstone by means of a small hammer.
a. The separation, generally with a handheld hammer, of worthless minerals
from desired minerals in a mining operation; e.g., quartz from feldspar.
Syn:hand cobbing; piking. AGI
b. Rubble, such as from furnace bottoms, impregnated with copper.
Standard, 2
A flat piece of wood used in cobbing. Fay
A special chisel type of hammer used to separate the mineral in a lump
from the gangue in the hand-picking of ores. Nelson
a. A usually rounded or semirounded rock fragment between 3 to 12 in (76
to 305 mm) in diameter; large than a pebble and smaller than a boulder,
rounded or otherwise abraded in the course of aqueous, eolian, or glacial
transport. Syn:cobblestone
b. Eng. Small lump coal. See also:cob coal
A sluice with a cobble-paved bottom used in placer mining. Nelson
A graded size of anthracite below large coal--about 5 in (12 cm).
Nelson
a. A naturally rounded, usually waterworn stone suitable for use in paving
a street or in other construction. Syn:cobble; roundstone. AGI
b. A consolidated sedimentary rock consisting of cobble-size particles.
AGI
Eng. Cleaning the haulage road of coal that has fallen off the trams.
A large round piece of coal.
Upper Lower Devonian. AGI
See:chlorophane
See:cockade ore