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Topic: Calcite


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  Calcite - LoveToKnow 1911
An opaque calcite of a grass-green colour, occurring as large cleavage masses in central India and known as hislopite, owes its colour to enclosed "greenearth" (glauconite and celadonite).
Optically, calcite is uniaxial with negative bi-refringence, the index of refraction for the ordinary ray being greater than for the extraordinary ray; for sodium-light the former is 1.6585 and the latter 1.4862.
The wide distribution, under various conditions, of crystallized calcite is readily explained by the solubility of calcium carbonate in water containing carbon dioxide, and the ease with which the material is again deposited in the crystallized state when the carbon dioxide is liberated by evaporation.
www.1911encyclopedia.org /Calcite   (1740 words)

  
 calcite. The Columbia Encyclopedia, Sixth Edition. 2001-05
Calcite also occurs in a number of massive forms, in which it may be coarsely to finely granular (as in marble), compact (as in limestone), powdery (as in chalk), or fibrous.
Millions of tons of calcite, in the form of limestone and marble, are mined annually.
Besides its use as a building stone, it is the raw material for quicklime and cement, and is used extensively as a flux in smelting and as a soil conditioner.
www.bartleby.com /65/ca/calcite.html   (226 words)

  
 Accessing New Realities: The Calcite Family
Like all the calcites, blue calcite helps to release the rigidities that prevent people from being able to see their lives and its challenges from an expanded perspective.
Pink calcite is hard to find in rhomboid form, and is most commonly found in chunks which are then tumbled.
On a spiritual level, calcite teaches us the importance of allowing new energies to flow through us, and to dare to trust that it's all right for us to crack the shells of old beliefs, and to open ourselves to the expanded beings we've been all along.
www.rainbowcrystal.com /crystal/gems/calcite.html   (1618 words)

  
 CALCITE (Calcium Carbonate)
Calcite is even a major component in the igneous rock called carbonatite and forms the major portion of many hydrothermal veins.
The extremely high index of refraction of calcite that causes the easily seen double refraction is also responsible for the interference colors (pastel rainbow colors) that are seen in calcites that have small fractures.
One notable case of fluorescence occurs at Franklin, New Jersey where the massive calcite is enriched in a small amount of manganese and fluoresces a bright red under UV light.
mineral.galleries.com /minerals/carbonat/calcite/calcite.htm   (1955 words)

  
 Calcite Gallery
Calcite crystals up to 1,5cm on Copper matrix - Overall size 5,5x4x3cm - April of 1974
Half part of a boulder found in the bed of this rivoulet.
Calcite crystal covered by Smithsonite (Var: Cuprian Smithsonite).
www.mindat.org /gallery.php?min=859   (104 words)

  
  Calcite Mineral,Calcium Carbonate,Calcite Information,Calcite Applications
Super white quality of calcite in powder form (-300 mesh) is used in the manufacture of paint and distemper.
Calcite is found in veins traversing various rock types, particularly limestone of the Aravalli and Ajabgarh series in Rajasthan, India.
During mining the calcite is sorted out into different grades depending upon the colours as they fetch different prices and also, because their suitability depends upon the colours.
www.mineralszone.com /minerals/calcite.html   (508 words)

  
  Calcite - Search View - MSN Encarta
Calcite crystals and calcite-rich rocks are valuable for a variety of uses that range from components in optical instruments to cement.
Calcite and aragonite have identical chemical compositions, but the molecules are stacked differently in the crystals.
In industry, calcite is valuable because it facilitates removal of silica and aluminum impurities in iron, neutralizes acids, and aids in the manufacture of paper and glass.
encarta.msn.com /text_761573488__1/Calcite.html   (1405 words)

  
 Calcite
Calcite is a form of calcium carbonate, and is generally found in sedimentary rock.
Calcite occurs as a fossil remnant of ancient shellfish and other creatures that used calcium in their makeup to form a hard shell or framework, like corals.
Calcite is the primary component of marine shells and is the stable form of calcium carbonate.
www.iscid.org /encyclopedia/Calcite   (227 words)

  
 Calcite - MSN Encarta
Calcite contains the carbonate ion (CO3-2), making it part of the carbonate family of minerals, which also includes dolomite, azurite, and aragonite.
Thus, the solubility of calcite is sensitive to the acidity of the water.
Chalk, a form of limestone, consists of the calcium carbonate remains of innumerable microscopic floating marine organisms, such as foraminifera and coccolithophores.
encarta.msn.com /encyclopedia_761573488/Calcite.html   (709 words)

  
 Tigerblossom Calcite!
Calcite can be colorless, yellow, brown, white or pinky-white, red, green and various other colors, including pale shades of gray, yellow, red, green, blue, brown to fl when impure; vitreous, dull, and streak white.
Calcite is one of the most common minerals on the face of the Earth, comprising about 4% by weight of the Earth's crust and is formed in many different geological environments.
Inlaid calcite was used on the throne in the Tomb of Tutankhamun c.1340 B.C.E. 1669 Erasmus Bartholinus (Denmark).
www.tigerblossom.com /calcite.htm   (1028 words)

  
 Calcite Cements in a Fluvial Cycle   (Site not responding. Last check: 2007-11-01)
Calcite cements in the overbank deposits have a pervasive horizontal orientation and are associated with gleying of the surrounding rock (Figure 3; Figure 4).
The forth generation of calcite is a blocky calcite that has a variety of crystal sizes 140 microns to 340 microns (Figure 6I and 6K) and is zoned in CL (Figure 6J and 6L).
Calcite cements display displacive fabrics such as floating grains and grains that are broken and filled with calcite at the base of the sandstone layers and the top of the underlying overbank deposit.
www.geo.sunysb.edu /lig/Conferences/abstracts_02/sookdeo/calcite_cements_in_a_fluvial_cyc.htm   (2075 words)

  
 Calcite Cements in a Fluvial Cycle   (Site not responding. Last check: 2007-11-01)
Calcite cements in the overbank deposits have a pervasive horizontal orientation and are associated with gleying of the surrounding rock (Figure 3; Figure 4).
The forth generation of calcite is a blocky calcite that has a variety of crystal sizes 140 microns to 340 microns (Figure 6I and 6K) and is zoned in CL (Figure 6J and 6L).
Calcite cements display displacive fabrics such as floating grains and grains that are broken and filled with calcite at the base of the sandstone layers and the top of the underlying overbank deposit.
pbisotopes.ess.sunysb.edu /lig/Conferences/abstracts_02/sookdeo/calcite_cements_in_a_fluvial_cyc.htm   (2075 words)

  
 Olympus Microscopy Resource Center: Light and Color - Birefringence in Calcite Crystals: Interactive Java Tutorial
In fact, birefringence in calcite is so strong that not only are there two waves, but even the directions of the two waves become separated.
The concept of utilizing transparent polarized materials to determine the electric vector directions for the extraordinary and ordinary rays in calcite is presented in Figure 1(a) and (c).
The calcite crystal in Figure 1(a) is oriented so that the extraordinary ray is transmitted, but the ordinary ray is absorbed by the polarizer.
www.olympusmicro.com /primer/java/polarizedlight/calcite   (1353 words)

  
 Calcite   (Site not responding. Last check: 2007-11-01)
Calcite is a major rock-forming mineral and has a number of crystal forms.
Calcite is the principal component of limestones, marble and other calcareous sedimentary rocks.
Calcite can be mistaken for quartz but a simple test of hardness can distinguish the two.
www.es.ucl.ac.uk /schools/Glossary/calcite.htm   (145 words)

  
 The mineral calcite
Calcite belongs to the calcite group, a group of related carbonates that are isomorphous with one another.
All members of the calcite group crystallize in the trigonal subdivision of the hexagonal system (as rhombohedrons and scalenohedrons), have perfect rhombohedral cleavage, and exhibit a strong double refraction in transparent rhombohedrons.
Calcite forms rocks that are used for ornamental purposes, such as Marble and banded Travertine or Tufa.
www.egyptian.net /~grafton/rockcoll/group5/calcite.htm   (1209 words)

  
 Crystals and Minerals - Calcite
Calcite conforms to the hexagonal crystal structure, where prismatic, tabular, rhombohedral, and scalenohedral habits are common.
Calcite generally forms in metamorphic and calcareous sedimentary rocks, in caves as stalactites and stalagmites, and also from seawater precipitation on shells of living organisms.
Calcite is often found in association with quartz, galena, zeolites, biotite, apatite, emerald, gold, sulphur, celestite, barite, and sphalerite.
www.crystals.co.za /info/calcite.htm   (374 words)

  
 DRAM, FGS, Calcite
Calcite has a hardness of 3.0, a specific gravity of 2.7, and a white or colorless streak.
In limestone quarries calcite can be found occurring massively or as long needle-like and block-shaped crystals within open cavities or seams in the limestone.
As the principal mineral in sea shells calcite is found in both recent and fossil marine and fresh water animal remains.
www.dep.state.fl.us /geology/geologictopics/rocks/calcite_xtals.htm   (164 words)

  
 Iran Calcite,calcite mineral,calcite   (Site not responding. Last check: 2007-11-01)
Calcite is also used in chemical and optical uses and as mineral specimens.
Calcite forms rocks that are used for ornamental purposes, such as Marble and banded Travertine or Tufa.
Calcite is also the main component of Chalk, which is processed as drawing chalk.
www.mineralco.net /calcite.htm   (1979 words)

  
 Calcite
Calcite is a very common but extremely diverse mineral - Goldschmidt (1913) illustrates 2544 habits of Calcite crystals, and many collectors have formed exquisite collections of Calcite.
Calcite is for all practical purposes stable in a normal household environment.
Calcite is readily soluble in acids and should never be treated with acid, vinegar, lemon, etc.
www.hedegaard.biz /Mineraler/Calcite.html   (1766 words)

  
 Calcite
Crystals of calcite are rare, and the mineral is generally coarse to fine granular or compact, with cleavage rhombohedrons as much as 6 inches thick, showing distinct striations due to pressure twinning.
Granular crystalline calcite is the sole gangue mineral of both zinc-ore deposits, is the principal constituent of the wall rocks and of the Franklin limestone as a whole, and is the chief material filling the secondary transverse veins in the Franklin ore body.
In veins in the Buckwheat mine containing, among other species, zincite and pyrochroite (see page 39), calcite was found partly as poorly crystallized masses filling the vein, and partly as exquisite transparent crystals of slender prismatic habit, peculiar in the equal development of prisms of both orders.
franklin-sterlinghill.com /palache/calcite.stm   (706 words)

  
 calcite.html
Most of the state's calcite occurrences are in a region underlain by Paleozoic carbonate rocks, which extend in a wide curving band across the state from St. Croix County in the west, south along the Mississippi Valley east to Madison, then north to Green Bay and the Door Peninsula.
Calcite occurs as travertine in athe Sweeney Quarry quarry west of Spring Valley on 250th Street, SW 1/4 sec.
The calcite is cream to pale yellow-green and forms flattened crystals with trigonal prism faces and rhombohedron terminations, spherical aggregates of bladed crystals and cleavable masses intergrown with fibrous tremolite along fractures (Cordua, 1989b).
www.uwrf.edu /~wc01/calcite.htm   (2980 words)

  
 Calcite - Search Results - MSN Encarta
Limestone is composed principally of calcite, or calcium carbonate.
Calcite is virtually insoluble in pure water, but is highly vulnerable to the...
Some crystals, such as calcite, tourmaline, and quartz, exhibit the property of double refraction, or birifringence.
uk.encarta.msn.com /Calcite.html   (98 words)

  
 Calcite   (Site not responding. Last check: 2007-11-01)
Calcite has many habits, The most common are hexagonal prisms with simple to complex terminations;scalenohedra, often with combinations of other forms;rhombohedra, either acute or flattened; and tabs with well-developed basal faces.
Calcite is also found as a massive rock-forming mineral, as nodules or crusts, in speleothems, and as fine to coarse granular aggregates.
Calcite also occurs in some rare carbonate-rich igneous rocks and is a common cement in some sandstones.
geology.csupomona.edu /alert/mineral/calcite.htm   (204 words)

  
 Calcite   (Site not responding. Last check: 2007-11-01)
Calcite is one of the most common minerals on the earth.
Calcite will glow in a multitude of colors in fluorescent lighting, but only in those specimens that contain manganese.
Calcite in its colorless state is sometimes seen en cabochon to display a cat’s eye effect.
www.dandennis.com /calcite.htm   (219 words)

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