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EUDIALYTE |
Rare mineral |
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BROMYRITE |
Silver bromide, a rare mineral; -- called also
bromargyrite. |
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PHILIPPIUM |
A rare and doubtful metallic element said to have been
discovered in the mineral samarskite. |
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THULIUM |
A rare metallic element of uncertain properties and
identity, said to have been found in the mineral gadolinite. |
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BREWSTERITE |
A rare zeolitic mineral occurring in white monoclinic
crystals with pearly luster. It is a hydrous silicate of aluminia,
baryta, and strontia. |
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PHOSGENITE |
A rare mineral occurring in tetragonal crystals of a
white, yellow, or grayish color and adamantine luster. It is a
chlorocarbonate of lead. |
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SAMARSKITE |
A rare mineral having a velvet-black color and
submetallic luster. It is a niobate of uranium, iron, and the yttrium
and cerium metals. |
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PETALITE |
A rare mineral, occurring crystallized and in cleavable
masses, usually white, or nearly so, in color. It is a silicate of
aluminia and lithia. |
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MICROLITE |
A rare mineral of resinous luster and high specific
gravity. It is a tantalate of calcium, and occurs in octahedral
crystals usually very minute. |
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DECIPIUM |
A supposed rare element, said to be associated with
cerium, yttrium, etc., in the mineral samarskite, and more recently
called samarium. Symbol Dp. See Samarium. |
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COLUMBIUM |
A rare element of the vanadium group, first found in a
variety of the mineral columbite occurring in Connecticut, probably at
Haddam. Atomic we... |
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ZIRCONIUM |
A rare element of the carbon-silicon group, intermediate
between the metals and nonmetals, obtained from the mineral zircon as a
dark sooty pow... |
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ERBIUM |
A rare metallic element associated with several other rare
elements in the mineral gadolinite from Ytterby in Sweden. Symbol Er.
Atomic weight ... |
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ESCHYNITE |
A rare mineral, containing chiefly niobium, titanium,
thorium, and cerium. It was so called by Berzelius on account of the
inability of chemica... |
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CAESIUM |
A rare alkaline metal found in mineral water; -- so called
from the two characteristic blue lines in its spectrum. It was the
first element dis... |
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TELLURIUM |
A rare nonmetallic element, analogous to sulphur and
selenium, occasionally found native as a substance of a silver-white
metallic luster, but ... |
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CHROMIUM |
A comparatively rare element occurring most abundantly in
the mineral chromite. Atomic weight 52.5. Symbol Cr. When isolated it
is a hard, brit... |