Calcite
Chemical composition -- Calcium carbonate. The colorless transparent crystals are known as Iceland spar.
Color -- Colorless or shades of pink, purplish red (cobaltocalcite), green, blue, yellow.
Calcite
From Wikipedia, the free encyclopedia
Jump to: navigation, search ...
CALCITE
Overview: Calcite belongs to the calcite group, a group of related carbonates that are isomorphous with one another.
CALCITE from Strontian
Calcite is found in several forms... rhombic, "dog-tooth", discoidal, flos-ferri...
It occurs with all the other species found at the locality.
The Calcite Family
One key aspect of calcite is its most common shape, the three-dimensional parallelogram called a rhomboid. A rhomboid has six parallel planes (visualize this as top, bottom, side, side, end, end) all connected to each other).
Calcite (sparry) (Iceland Spar)CaCO3
Class: Carbonate
Hardness: 3
Density: 2.7
Streak: White
Lustre: Vitreous
Habit: Large crystals, some exhibiting common twin striae
Colours: White ...
Calcite
aka Calcspar, Cave Onyx, Flowstone, Iceland Spar, Lime Spar, Mexican Jade, Mexican Onyx, Nailhead Spar, Pineapple Jasper
Calcite is the one of the most common minerals on earth, constituting about 4% of the Earth's crust by weight.
CALCITE
Calcite (Calcium Carbonate, CaCO3) is a very common mineral that comes in a wide variety of forms, shapes and colors. The trigonal crystals range from translucent to transparent.
Calcite and the divided highway
Calcite and the laser pointer
Itacolumbite the bending rock
Growing halite crystals in the classroom
Ulexite the television stone (coming soon!)
Natural Magnetism...
Calcite
Calcite is used in jewelry because its a mineral that is inexpensive and comes in a variety of shapes, sizes, and colors.
Calcite Stalagmites
Photo from National Museum of Natural History, Smithsonian Institution Mineral Gallery
Photograph by Chip Clark ...
Calcite Clues
This common mineral is being used as a gauge of tectonic stress and strain.
Carbonate Minerals
Two very important minerals and a flock of minor, but popular minerals.
Calcite
See Orange Calcite (M-O)
Carnelian
Master Communicator & a good luck stone. It energizes the blood and has protective energies. It helps memory, even recalling past lives.
calcite - is a very soft mineral that occurs in a transparent to semitranslucent material, in a wide variety of color and patterns. Some of the varieties include Iceland spar, satin spar, marble and travertine. Sources: widespread.
calcite Number three on the Mohs Hardness Scale consisting of calcium carbonate.
carat A specific weight measurement for gems and diamonds in the metric system. There are -ve carats to a metric gram. Not to be confused with karat.
Calcite: CaCO3 -vs- Smithsonite: ZnCO3
Both consist of five atoms per unit: either a Ca or a Zn plus one carbon and three oxygens. Both are put together with the "atomic packing" characteristic of the orthorhombic system of crystals.
3. Calcite
Calcite is an anhydrous carbonate, and one of the most widely distributed minerals on the Earth's surface. It is a common constituent of sedimentary rocks. In crystallized form, Calcite has a vitreous luster.
Absolute Hardness: 9 ...
Calcite
Calcite is rarely cut into gemstones; it is soft with a hardness of 3 and it has perfect cleavage in three directions which makes it is quite difficult to cut.
Calcite
Okeechobbe Co.
Calcite - 3.0cm x 8.0cm
Calcite - Ruck's Pit, 5.2cm x 4.5cm ...
Calcite
This is the one of the most common minerals on earth, constituting about 4% of the Earth's crust by weight. It is usually a clear or whitish stone, but also occurs in a vast range of shapes and colours.
calcite, chalcopyrite, sphalerite, galena, linneite, gerdorffite
Locals:
Misc: ...
Calcite is abundant but not as collectable minerals specimens. Occurs as tabular, colorless masses in granite and as gray crystallized clusters on augite.
Calcite is the most common, well crystallized, and collectible mineral with these forms. See figure 6.21 for some crystallization forms of calcite. Several other minerals, such as chabazite and corundum, commonly show form combinations.
Calcites from China. Will Larson began collecting these specimens a few years ago. They exemplify the new material coming from China. Budding collectors can take advantage of new material today, since it may be harder to come by tomorrow.
Calcite: Calcium Carbonate is a mineral that is variable in color and form. It has a white streak and is brittle. It is translucent to transparent. It is found in abundance in limestone and marbles.
- C - Calcite - Astrological sign of Cancer The various crystallized forms of calcite include masses, grains, stalactites, scalenohdrons, and rhombohedrons. It is, however, characterized by the rhombohedron crystallization.
Enhancements
Calcite is not enhanced.
More information on gemstone enhancements.
Iceland Spar ...
calcite (group) Group of minerals belonging to the carbonate group that are isomorphous with one another and have the same properties, such as that they all:
1.
CALCITE Clear Insight, clarity, forgiveness and manifestation
CALCITE Blue Psychic ability, astral travel, soothing the emotional body ...
(Calcite)
Scepter Crystal - A compound crystal where a larger crystal has grown atop a smaller prismatic crystal.
Schiller - An irridescent luster, as in some feldspars (Labradorite)
Schistose - Thinly layered, as in schist rocks.
Calcium carbonate may crystallize in either of two forms, calcite or aragonite. In marble we have calcite.
1) Muzo - Emerald in calcite veins that invade black shale.
Rough is often color zoned with paler core. Both Muzo and Chivor emeralds are characterized by three-phase inclusions - trapped fluid containing gas, fluid, and crystals of halite.
As a response to an irritating object inside its shell, the mollusk will deposit layers of calcium carbonate in the form of the minerals aragonite or calcite (both crystalline forms of calcium carbonate) held together by an organic horn-like ...
as quartz gold, and diamond accumulate in the coarsest detrital sedimentary rocks, less resistant minerals such as feldspars, which weather to clays, accumulate in finer grained siltstones and mudstones, and the most soluble minerals such as calcite ...
It has an optical calcite mounted inside the tube and produces a double image of the square opening. Enough bright light is directed on a gemstone and viewed through the dichroscope.
This name is often erroneously applied to the alabaster, calcite and aragonite used in the manufacture of souvenirs and other ornamental objects sold throughout the tourist centres of the Mediterranean.
Lapis lazuli contains the minerals calcite (which decreases its value), pyrite (which can increase its value), and sodalite. Swiss lapis is not Lapis lazuli at all; it is dyed jasper.
Lapis Lazuli or Lapis - Lapis may contain other minerals, such as calcite, pyrite, amphibole, apatite, diopside, feldspar, sphene, and zircon. The name comes from Arabic "allazward" meaning sky or blue.
Examples are: banded agate which is dyed various colours; calcite which is then termed Mexican jade; chalcedony which, after being dyed and heated, is cornelian, or when green or blue is sometimes called 'emeraldine' or 'blue moonstone'; ...
It has a typical cobalt blue color, often with patches of pyrite (golden) and/ or calcite (white). It was this rock which was powdered to create the ultramarine pigment used by painters prior to the 19th century[1].
Lapis Lazuli occurs in various shades of blue with some qualities being speckled with white calcite and some with yellow . The finest Lapis Lazuli is even blue color with little or no veining from other elements.
Consisting mainly of lazurite, lapis also contains brassy pyrite specks and white calcite veins and patches.
Fluorite at 4 is not twice as hard as gypsum at 2; nor is the difference between calcite and fluorite similar to the difference between corundum and diamond. An absolute hardness scale looks a little different than the relative scale.
NACRE - The iridescent substance containing aragonite and calcite crystals. This is an important outside layering material and a constituent of a pearl and cultured pearls. The thicker the nacre the longer the pearl has been allowed to grow.
As lapis lazuli (Arabic/Latin blue stone) is composed of several minerals (if only in small quantities - augite, calcite, diopside, mica, hauynite, hornblende, pyrite) some experts consider it not to be a mineral, but a rock; ...
dichroscope - an instrument consisting of a calcite rhomb (crystal), used to detect dichroism in gemstones.
die casting - the method of casting in a metal mold.
die forming - The act of forcing sheet metal into a die.
Imperial Mexican jade is not jade at all; it is calcite that has been dyed green.
INCA EMERALD
Inca emerald is an emerald that is mined in Equador.
nacre
The crystalline substance made of aragonite and calcite crystals bound together by conchiolin, which mollusks like oysters secrete around foreign objects within their shells, layers of which eventually form a pearl ...
Marble: A metamorphic rock composed of calcium carbonate, (like aragonite or coral), or carbonate of lime, (limestone or dolomite, a variety of calcite), which is swirled or clouded with color.
Beautiful deep blue-violet sodalite that is accented with white streaks of calcite. A wonderful lapis lazuli look-alike. This gemstone come from Brazil. Sodalite is the gemstone guardian for heroes and heroines ...
Lapis is considered a rock, not a mineral. It combines various minerals, mostly lazurite, but also contains calcite (white), sodalite (blue) and pyrite (fools' gold, a metallic yellow) and to be considered a mineral it would have only one component.
Montana.--Facet-quality calcite and sphalerite are recovered from deposits in the State.
Lapis Lazuli A lovely blue gemstone composed mainly of lazurite and calcite, popular in ancient Egypt. Said to promote emotional healing and stability.
Lapis Lazuli: A royal blue opaque semiprecious stone with white veins or patches of calcite and a few gold-looking metallic flecks of pyrite. Lapis can be dyed to enhance the color.
A medium to dark blue semiprecious stone that contains patches and veins of white (white calcite) and copper. While sodalite can also be found in grey and white, blue is generally used to produce jewelry.
Split ring ...
The ten-point scale of mineral hardness, keyed arbitrarily to the minerals talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond.
Treated Diamond ...
Top quality Lapis is a strong blue, sometimes with a hint of violet. The value of Lapis decreases with the presence of white patches (Calcite), but small veins of Pyrite can increase the value. The presence of Pyrite is often a personal preference.
Calcite
2. Gypsum
1. Talc (softest)
Because the numbers are based on properties of actual stones, they are not equally distributed.
The most valued color in a lapis lazuli is the violetish blue of mid to dark tones with very little specks of pyrite and no calcite, although many people also like pieces with white and golden spots.
There are some minerals for which this is very helpful -- azurite is always blue and galena is always silver, for example -- but some minerals can come in any color, (e.g., calcite, quartz, fluorite) and most do come in more than one.
 See also: Crystal, Stone, Mineral, Crystals, Color
|
