calcite

Definitions

  • WordNet 3.6
    • n calcite a common mineral consisting of crystallized calcium carbonate; a major constituent of limestone
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Webster's Revised Unabridged Dictionary
    • n Calcite kăl"sīt (Min) Calcium carbonate, or carbonate of lime. It is rhombohedral in its crystallization, and thus distinguished from aragonite. It includes common limestone, chalk, and marble. Called also calc-spar and calcareous spar.Argentine is a pearly lamellar variety; aphrite is foliated or chalklike; dogtooth spar, a form in acute rhombohedral or scalenohedral crystals; calc-sinter and calc-tufa are lose or porous varieties formed in caverns or wet grounds from calcareous deposits; agaric mineral is a soft, white friable variety of similar origin; stalaclite and stalagmite are varieties formed from the drillings in caverns. Iceland spar is a transparent variety, exhibiting the strong double refraction of the species, and hence is called doubly refracting spar.
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Century Dictionary and Cyclopedia
    • n calcite Native calcium carbonate, or carbonate of lime, one of the commonest of minerals. It occurs in a great variety of crystalline forms, rhombohedrons, scalenohedrons, etc.; the fundamental form being a rhombohedron with a terminal angle of 105°, parallel to which the crystallized mineral has highly perfect cleavage, so that a mass of it breaks up with a blow into a great number of small rhombohedrons. The transparent colorless variety is called Iceland spar or doubly refracting spar, and is used for the prisms of polariscopes. Dogtooth spar is a variety in acute scalenohedral crystals. Satin-spar is a fibrous, and argentine a pearly lamellar variety; the granular, compact, or cryptocrystalline varieties constitute marble, limestone, chalk, etc. Stalactites and stalagmites are forms deposited in limestone caves; calc-sinter, calc-tuff, or travertin is a porous deposit from springs or rivers which in flowing through limestone rocks have become charged with calcium carbonate. Agaric mineral, or rock-milk, is a soft white variety easily crumbled in the fingers; it is sometimes deposited in caverns. (See cut under spar.)
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Chambers's Twentieth Century Dictionary
    • ns Calcite native calcium carbonate, or carbonate of lime—also called Calcā′reous spar and Calc′spar
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Etymology

Webster's Revised Unabridged Dictionary
L. calx, calcis, lime
Chambers's Twentieth Century Dictionary
Formed from L. calx, chalk.

Usage

In literature:

The density of the globules (2.58) is similar to that of ordinary varieties of calcite.
"Scientific American Supplement, No. 286" by Various
The first of these is calcite.
"Scientific American Supplement, No. 344, August 5, 1882" by Various
It crystallizes in similar form to calcite, and in both cases thin plates obtained by cleavage may be used.
"Scientific American Supplement, No. 441, June 14, 1884." by Various
This chamber proved to be a little gem; small but high, and beautifully adorned with calcite crystal.
"Cave Regions of the Ozarks and Black Hills" by Luella Agnes Owen
Cell life was powerless before the vanquishing crystals of the infiltrating calcite.
"Some Winter Days in Iowa" by Frederick John Lazell
The calcite cuts it through at every charge.
"The Crown of Wild Olive" by John Ruskin
Sandstone mortar, eye in green glaze (28), the other objects as in N. 1, but with the addition of tablets of calcite and lead.
"El Kab" by J.E. Quibell
A vase of calcite, also dedicated by Entemena, has been found at Nippur.
"Encyclopaedia Britannica, 11th Edition, Volume 3, Part 1, Slice 1" by Various
Cerium looks like iron, having both its color and lustre, but is heavier, and has the hardness of calcite.
"The Galaxy, Volume 23, No. 2, February, 1877" by Various
Joined with calcium it forms the mineral calcite, or carbonate of lime.
"Earth and Sky Every Child Should Know" by Julia Ellen Rogers
Weathering produces epidote, calcite, sericite and kaolin.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 5" by Various
This is decomposed, leaving a yellow stain of ferric hydrate where the calcite occurred.
"Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 6" by Various
Besides the ordinary shell money, there is a sort of stone coinage, consisting of huge calcite or limestone discs or wheels from 6 in.
"Encyclopaedia Britannica, 11th Edition, Volume 5, Slice 4" by Various
A ring-shaped plate of calcite, secreted by the ectoderm, is then formed, lying between the embryo and the surface of attachment.
"Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 2" by Various
Fluor-spar has a hardness of 4, so that it is scratched by a knife, though not so readily as calcite.
"Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5" by Various
The stringers in the 8th stratum of stone, which fuse in the fire of the second order, were possibly calcite.
"De Re Metallica" by Georgius Agricola
Sundry gold-reefs in Queensland, New South Wales, Victoria, and Bohemia are full of calcite.
"The Romance of Industry and Invention"
Thus in calcite the rhombohedral angle (the angle between two faces of the fundamental rhombohedron) is 74 deg.
"Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 7" by Various
The most common petrifying materials are calcite, silica, and pyrite.
"The Elements of Geology" by William Harmon Norton
The rocks along this stream are all sandstones, limestone and conglomerates, with many thin calcite veins.
"Golden Alaska" by Ernest Ingersoll
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In news:

The SS Calcite , a self-unloading bulk carrier built specifically for Bradley Transportation Co.
The SS Calcite, a self-unloading bulk carrier built specifically for Bradley Transportation Co.
SS Calcite freighter turns 100 today.
In order to celebrate the centennial of operations at Calcite Quarry, festival planners have pulled out the stops, Dennis Downie, festival committee chairman, said.
Calcite flowstone from a fault precipitation.
It consists essentially of calcite (around 99%), the crystalline, white porous structure of calcium carbonate.
Raymond is retired from Calcite Limestone Quarry, but continues to work and build with tons of rock.
As part of a long-term move to extend the Huron Sunrise Trail, members of City of Rogers City Council voted Tuesday to extend its southern end by about 1,000 feet to reach Calcite Road.
The stone—a calcite crystal called Iceland spar—funnels light into two beams.
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In science:

The solid line in panel (C) depicts the tropical sea surface temperatures relative to today, as inferred from calcite and aragonite shells in the past ∼ 550 Myr [103].
The Spiral Structure of the Milky Way, Cosmic Rays, and Ice Age Epochs on Earth
We have developed a novel technique to grow nearly perfectly spherical crystals of the calcium carbonate mineral vaterite, which has similar birefringence properties to calcite, within the required size regime.
Optical microrheology using rotating laser-trapped particles
When looking at a picture through crystal of Icelandic spar (calcium carbonate, calcite) he saw two displaced images.
Angular Momentum of Electromagnetic Radiation. Fundamental physics applied to the radio domain for innovative studies of space and development of new concepts in wireless communications
Polarimetric observations of the afterglow of GRB 021004 at the NOT were performed from October 4.859 UT until 4.908 UT (∼8 to 10 hours after the burst) with the Andalucia Faint Object Spectrograph and Camera (ALFOSC), using two calcite plates at different orientations and a Bessel R filter.
Variable polarization in the optical afterglow of GRB 021004
The calcite plate yields two overlapping images of the field-of- view (FOV) of the telescope, separated by about 15 arcsec.
Variable polarization in the optical afterglow of GRB 021004
For each observation, the orientation of the calcite plate was either 45 degrees or 90 degrees.
Variable polarization in the optical afterglow of GRB 021004
In the ALFOSC case, however, the calcite plate projects images for the ordinary and extra-ordinary ray differently, which results in the PSFs being different for the two images, and, for small apertures, the incorrect ratio of light to be measured.
Variable polarization in the optical afterglow of GRB 021004
P and θ from the separate measurements with the calcite plate at 45 and 90 degrees, is not valid.
Variable polarization in the optical afterglow of GRB 021004
Beforehand, the polarisation of each of the two beams has been prepared in a ”polariser unit” made of a calcite Glan polariser that defines the vertical polarisation, and several half-wave plates that are mechanically inserted to work with horizontal, or +/- 45◦ polarisation.
Pump-probe measurement of atomic parity violation in caesium with a precision of 2.6%
The polarizer is composed of two prisms in calcite.
AMBER Task Force February 2008 run report
Permeability, porosity and pore geometry of hot-pressed calcite.
Evaluation of a permeability-porosity relationship in a low permeability creeping material using a single transient test
He used a stepwise rotated half wave plate and a calcite crystal as analyzer.
Observing the Second Solar Spectrum at IRSOL
The advantages of the IRSOL two beams exchange system are: its broad spectral performance (limited by the calcite transparency), its simplicity, the good polarimetric sensitivity, and its photon efficiency.
Observing the Second Solar Spectrum at IRSOL
The required stability was achieved by employing calcite beam displacers in an interferometerically stable configuration .
Quantum-optical state engineering up to the two-photon level
The 2 polarizers are identical, they are designed as Glan-Thompson prisms: made of two right-angled Calcite prisms cemented together2 .
Design of the wavefront sensor unit of ARGOS, the LBT laser guide star system
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