See:cuprite
A yellow or orange-red variety of spinel; an aluminate of magnesium.
CF:ruby spinel
A soft, silvery-white, metallic element of the alkali metal group, closely
resembling potassium. Symbol, Rb. Widely distributed in small quantities
in nature. Obtained commercially from lepidolite and from potassium
minerals. Forms amalgams with mercury and alloys with gold, cesium,
sodium, and potassium. Has been considered for use in space vehicles, and
for use in thermoelectric generators. Handbook of Chemistry and Physics, 3
Miners' term for the red silver sulfides pyrargyrite, proustite, and
miargyrite. Syn:ruby blende
See:lepidocrocite
A device by which coarse material in placer gravel is separated from the
fines and elevated onto a dump.
The red gem variety of corundum, the color due to the presence of chromium
in the structure. CF:sapphire
An abrasive similar to white alumina except ruby red in color because of
the presence of chromic oxide. ACSG, 2
An early name for realgar. See also:ruby sulfur
a. A reddish variety of sphalerite. Syn:ruby zinc
b. See:rubinblende
A girasol ruby with a chatoyant effect. CF:sapphire cat's eye
See:cuprite
See:cuprite
An old syn. for goethite. Fay
A red-colored beach sand containing garnets, as at Nome, AK. AGI
Dark ruby silver is pyrargyrite, and light ruby silver is proustite.
Dana, 4
A red gem variety of spinel. CF:almandine ruby; balas ruby; rubicelle.
See:realgar
Standard, 2; Fay
A red variety of cassiterite.
Miners' term for transparent red sphalerite or zincite.
Syn:ruby blende
Said of a sedimentary rock composed of a significant amount of fragments
coarser than sand grains; pertaining to a rudite. The term implies no
special size, shape, or roundness of fragments throughout the gravel
range, and is broader than pebbly, cobbly, and bouldery. Also said of the
texture of such a rock. AGI