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LENSES |
Prisms |
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CUBES |
Square-faced prisms |
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APATITE |
Native phosphate of lime, occurring usually in six-sided
prisms, color often pale green, transparent or translucent. |
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KAMPYLITE |
A variety of mimetite or arseniate of lead in hexagonal
prisms of a fine orange yellow. |
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CANTHARIDIN |
The active principle of the cantharis, or Spanish fly,
a volatile, acrid, bitter solid, crystallizing in four-sided prisms. |
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GIESECKITE |
A mineral occurring in greenish gray six-sided prisms,
having a greasy luster. It is probably a pseudomorph after elaeolite. |
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TRAJECT |
To throw or cast through, over, or across; as, to
traject the sun's light through three or more cross prisms. |
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CRAYON |
An implement for drawing, made of clay and plumbago, or of
some preparation of chalk, usually sold in small prisms or cylinders. |
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LANARKITE |
A mineral consisting of sulphate of lead, occurring
either massive or in long slender prisms, of a greenish white or gray
color. |
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CRONSTEDTITE |
A mineral consisting principally of silicate of iron,
and crystallizing in hexagonal prisms with perfect basal cleavage; --
so named from the Swedish mineralogist Cronstedt. |
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ANDALUSITE |
A silicate of aluminium, occurring usually in thick
rhombic prisms, nearly square, of a grayish or pale reddish tint. It
was first discovered in Andalusia, Spain. |
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APOPHYLLITE |
A mineral relating to the zeolites, usually occurring
in square prisms or octahedrons with pearly luster on the cleavage
surface. It is a hydrous silicate of calcium and potassium. |
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ICELAND SPAR |
A transparent variety of calcite, the best of which is
obtained in Iceland. It is used for the prisms of the polariscope,
because of its strong double refraction. Cf. Calcite. |
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TEINOSCOPE |
An instrument formed by combining prisms so as to
correct the chromatic aberration of the light while linear dimensions
of objects seen through... |
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PSEUDO-SYMMETRY |
...which they belong, as the apparently
hexagonal prisms of aragonite. ... |
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TOPAZ |
A mineral occurring in rhombic prisms, generally yellowish
and pellucid, also colorless, and of greenesh, bluish, or brownish
shades. It someti... |
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PERISCOPE |
An optical instrument of tubular shape containing an
arrangement of lenses and mirrors (or prisms), allowing a person to
observe a field of vie... |
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FLINT GLASS |
...ially
of a silicate of lead and potassium. It is used for tableware, and for
optical instruments, as prisms, its density giving a high degree of... |
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TOURMALINE |
A mineral occurring usually in three-sided or six-sided
prisms terminated by rhombohedral or scalenohedral planes. Black
tourmaline (schorl) is... |
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TAURINE |
...t crystallizes in colorless,
regular six-sided prisms, and is especially characterized by containing
both nitrogen and sulphur, being chemically... |
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BERYL |
A mineral of great hardness, and, when transparent, of much
beauty. It occurs in hexagonal prisms, commonly of a green or bluish
green color, b... |
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CARBON |
...nd in this it is soft, and occurs in hexagonal
prisms or tables. When united with oxygen it forms carbon dioxide,
commonly called carbonic acid,... |