spar

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spar.

For dogtooth spar, see calcitecalcite
, very widely distributed mineral, commonly white or colorless, but appearing in a great variety of colors owing to impurities. Chemically it is calcium carbonate, CaCO3, but it frequently contains manganese, iron, or magnesium in place of the calcium.
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; for fluorspar, see fluoritefluorite
or fluorspar
, mineral appearing in various colors, e.g., green, yellow-brown, rose, and red. Chemically, it is calcium fluoride, CaF2. Its crystals, commonly cubic, are transparent or translucent and under certain conditions exhibit fluorescence.
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; for heavy spar, see baritebarite
, barytes
[New Lat., from barium], or heavy spar,
a white, yellow, blue, red, or colorless mineral. It is a sulfate of barium, BaSO4, found in nature as tabular crystals or in granular or massive form and has a high specific gravity.
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; for satin spar, see calcitecalcite
, very widely distributed mineral, commonly white or colorless, but appearing in a great variety of colors owing to impurities. Chemically it is calcium carbonate, CaCO3, but it frequently contains manganese, iron, or magnesium in place of the calcium.
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 and gypsumgypsum
, mineral composed of calcium sulfate (calcium, sulfur, and oxygen) with two molecules of water, CaSO4·2H2O. It is the most common sulfate mineral, occurring in many places in a variety of forms. A transparent crystalline variety is selenite.
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. See also Iceland sparIceland spar,
colorless variety of crystallized calcite, characterized by its properties of transparency and double refraction. It is used chiefly in the manufacture of Nicol prisms, which are essential parts of polarizing microscopes and other optical instruments.
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 and feldsparfeldspar
or felspar
, an abundant group of rock-forming minerals which constitute 60% of the earth's crust. Chemically the feldspars are silicates of aluminum, containing sodium, potassium, iron, calcium, or barium or combinations of these elements.
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.

Spar

 

the equipment above the deck of a ship that is used for mounting loading gear, signals, lights, and radio antennas. Spars are also used as observation and communication posts. On modern self-propelled ships, spars include the masts, topmasts, yards, gaffs, and loading booms. On sailing ships, spars are used for raising, turning, and furling the sails.

spar

[spär]
(aerospace engineering)
A principal spanwise member of the structural framework of an airplane wing, aileron, stabilizer, and such; it may be of one-piece design or a fabricated section.
(mining engineering)
A small clay vein in a coal seam.
(mineralogy)
Any transparent or translucent, nonmetallic, light-colored, readily cleavable, crystalline mineral; examples are calespar and fluorspar.
(naval architecture)
A long, round stick of steel or wood, often tapered at one or both ends, and usually a part of a ship's masts or rigging.

spar

2. A bar for fastening a gate or door.
3. A heavy round timber.
4.See brotch.

spar

spar
A principal lateral, span-wise load-carrying member of an airplane or control surface.

spar

1
1. 
a. any piece of nautical gear resembling a pole and used as a mast, boom, gaff, etc.
b. (as modifier): a spar buoy
2. a principal supporting structural member of an aerofoil that runs from tip to tip or root to tip

spar

2
an unaggressive fight

spar

any of various minerals, such as feldspar or calcite, that are light-coloured, microcrystalline, transparent to translucent, and easily cleavable

SPAR

Early system on Datatron 200 series. Listed in CACM 2(5):16 (May 1959).