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Latest Calcite Stories

2ccbd123c4f0f4fb3d24c63eaf2a6d8d1
2009-05-27 08:32:14

Overfishing and disease have decimated shellfish populations in many of the world's temperate estuarine and coastal ecosystems. Smithsonian scientists, led by Whitman Miller, ecologist at the Smithsonian Environmental Research Center in Edgewater, Md., have discovered another serious threat to these valuable filter feeders"”rising levels of atmospheric carbon dioxide that contribute to the acidification of open ocean, coastal and estuarine waters. Their findings are being published in...

992f1f3a39132b05524dcbee5553915d1
2009-05-18 10:20:00

Many scientists currently think at least 5 percent of humanity's carbon footprint comes from the concrete industry, both from energy use and the carbon dioxide (CO2) byproduct from the production of cement, one of concrete's principal components.Yet several studies have shown that small quantities of CO2 later reabsorb into concrete, even decades after it is emplaced, when elements of the material combine with CO2 to form calcite.A study appearing in the June 2009 Journal of Environmental...

f812295cb84bf7ffd5c3f59f0b75319d
2009-05-04 10:21:15

Sea urchins dig themselves hiding holes in the limestone of the ocean floor using teeth that don't go blunt. Weizmann Institute scientists have now revealed their secrets, which might give engineers insights into creating ever-sharp tools or mechanical parts. The urchins dig holes to fit their globular bodies using their five teeth, which, like those of rodents, are ground down at the tip but continue to grow on the other end throughout the animals' lives. The amazing part, however, is that...

2008-08-06 09:00:45

TORONTO, ONTARIO--(Marketwire - Aug. 6, 2008) - Pelangio Mines Inc. (TSX:PLG) ("Pelangio") has been advised by Detour Gold Corporation ("Detour Gold") that it has released drill results of 21 holes from the Calcite and Gap Zones of its Phase II drilling program at the Detour Lake property in northern Ontario. Detour Gold started Phase II drilling in July 2007 and thus far has completed 351 holes totaling 137,702 metres (including 29 holes abandoned for 2,401 metres and deepening of 9 holes...

c3a85824ebeb16e873960b3a27c9dcd31
2008-07-24 13:32:20

At Fort Stanton Cave in New Mexico, hundreds of feet below the Earth's surface, an odd formation made up of an intricate crust of tiny calcite crystals continues to intrigue cave specialists and explorers. The formation is known as "Snowy River", due to its long, flowing presence on the cave's floor. It is thought to be the longest continuous cave formation in the world "” at least 4 miles long "” and explorers have yet to find its end. "I think Snowy River is one of the primo...

2008-07-17 03:00:29

By Anonymous SUMMER ENTICEMENTS: Despite the price of gasoline, there are mineral events aplenty to lure us onto the open road with our vacation days. For those who want to escape the heat and humidity of their home state, the cool climes of Michigan's Upper Peninsula entice with the Copper Country Mineral Retreat, 3-10 August, in the historic Lake Superior native copper district. The event encompasses a full schedule of activities: underground collecting, prepared surface collecting,...

33f5c5d470b3472696215e7d901e538e
2005-06-01 06:28:36

ALBUQUERQUE, N.M. -- A calcite formation named Snowy River could prove a gold mine for scientists. Snowy River, believed to be the largest continuous calcite formation in the world, was discovered in September 2001 by a Bureau of Land Management team led by veteran speleologist John McLean of Colorado. The stark white passage, looking like a river of snow surrounded by walls of brown clay and black manganese dioxide deposits, stretches more than two miles from Fort Stanton Cave in...


Latest Calcite Reference Libraries

28_3f12abda63415a07ee5b6c5d30ef8239
2005-05-26 12:17:18

Aragonite is a polymorph of the mineral calcite, both having the chemical composition CaCO3. Its structure differs from calcite and leads to a different crystal shape, an orthorhombic system with acicular crystals. By repeated twinning pseudo-hexagonal forms result. It may be columnar or fibrous, occasionally in branching stalactitic forms called flos-ferri (flowers of iron) from their association with the ores at the Carthinian iron mines. The type location for aragonite is Molina de...

28_9c404ab9a4754b403781670c9e631915
2005-05-26 11:59:32

he mineral calcite is a calcium carbonate corresponding to the formula CaCO3 and is one of the most widely distributed minerals on the Earth's surface. It is a common constituent of sedimentary rocks, limestone in particular. It is also the primary mineral in metamorphic marble. It also occurs as a vein mineral in deposits from hot springs, and also occurs in caverns as stalactites and stalagmites. Calcite is often the primary constituent of the shells of marine organisms (e.g. plankton,...

28_af149e6f4821ab4ec3c213f12d27e305
2005-05-26 09:38:30

Limestone is a sedimentary rock composed of the mineral calcite (calcium carbonate). The primary source of this calcite is usually marine organisms. These organisms secrete shells that settle out of the water column and are deposited on ocean floors as pelagic ooze (see lysocline for information on calcite dissolution). Secondary calcite may also be deposited by supersaturated meteoric waters (groundwater that precipitates the material in caves). This produces speleothems such as stalagmites...

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Word of the Day
omphalos
  • The navel or umbilicus.
  • In Greek archaeology: A central boss, as on a shield, a bowl, etc.
  • A sacred stone in the temple of Apollo at Delphi, believed by the Greeks to mark the 'navel' or exact center-point of the earth.
'Omphalos' comes from the ancient Greek.
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