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Latest Calcium carbonate Stories

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2009-10-26 15:28:49

Stony Brook University researchers find elevated carbon dioxide concentrations impede growth and survival of bivalve larvae Relatively minor increases in ocean acidity brought about by high levels of carbon dioxide have significant detrimental effects on the growth, development, and survival of hard clams, bay scallops, and Eastern oysters, according to researchers at Stony Brook University's School of Marine and Atmospheric Sciences. In one of the first studies looking at the effect of ocean...

2009-10-05 05:00:00

LAS VEGAS, Oct. 5 /PRNewswire-FirstCall/ -- Texas Wyoming Drilling, Inc. (Pink Sheets: TWDL) a publicly traded company on Pink Sheets, has announced that it has entered into a joint venture agreement with Legacy Rock Company, a Nevada based corporation, to mine and distribute Calcium Carbonate from properties owned by Legacy Rock Company. TWDL will be in charge of operations and profits will be divided on an equal basis, after TWDL recovers its costs. The properties are currently...

2009-05-28 15:26:08

U.S. marine scientists say they have discovered that rising levels of atmospheric carbon dioxide are threatening shellfish populations in many ecosystems. The researchers, led by ecologist Whitman Miller of the Smithsonian Environmental Research Center, said the increasing CO2 levels are contributing to the acidification of open ocean, coastal and estuarine waters. For shellfish and other organisms having calcium carbonate shells and structures, the problem begins when atmospheric CO2...

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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...

2009-01-16 10:51:06

An international team of scientists has solved a mystery that has puzzled marine chemists for decades. They have discovered that fish contribute a significant fraction of the oceans' calcium carbonate production, which affects the delicate pH balance of seawater. The study gives a conservative estimate of three to 15 percent of marine calcium carbonate being produced by fish, but the researchers believe it could be up to three times higher.Published January 16th in Science, their findings...

38040e1e573a30a12a59a4c0cb77d4be1
2009-01-16 08:00:00

Scientists have learned that fish poop may be beneficial to maintaining the delicate balance of the Earth's oceans. Using computer models, Rod W. Wilson, of the University of Exeter in England, and colleagues from the US, Canada and England discovered that bony fish excrete a crucial amount of inorganic carbon that works to maintain the oceans' ph balance. Using computer models, researchers estimated that bony fish produce between 812 million and 2,050 million tons of valuable inorganic...

2008-12-18 15:48:24

Concern about increasing ocean acidification has often focused on its potential effects on coral reefs, but broader disruptions of biological processes in the oceans may be more significant, according to Donald Potts, a professor of ecology and evolutionary biology at the University of California, Santa Cruz, and an expert in coral reef ecology and marine biodiversity. Potts gave an invited talk on "Geobiological Responses to Ocean Acidification" at the Fall Meeting of the American...

323e5bf7bac24b965cc56a647fba407e1
2008-11-25 08:15:00

Researchers now believe the ocean is growing more acidic faster than once thought, thanks to increasing levels of atmospheric carbon dioxide. University of Chicago scientists documented the phenomena in a paper published online in the Proceedings of the National Academy of Sciences. "Of the variables the study examined that are linked to changes in ocean acidity, only atmospheric carbon dioxide exhibited a corresponding steady change," said J. Timothy Wootton, the lead author of the study...

2008-11-05 09:00:23

TAI'AN CITY, Shandong, China, Nov. 5 /Xinhua-PRNewswire-FirstCall/ -- ShengdaTech Inc. ("ShengdaTech" or "the Company") , a leading manufacturer of nano precipitated calcium carbonate ("NPCC") and a major manufacturer of coal-based chemical products in Shandong Province, PRC, today announced that the Company will present at the upcoming Roth Capital "China Comes to Vegas Conference" held from November 19 - 21, 2008 in Las Vegas at the Wynn Hotel. The Roth Capital China Comes to Vegas...

2008-10-29 09:00:25

TAIAN CITY, Shandong, China, Oct. 29 /Xinhua-PRNewswire-FirstCall/ -- ShengdaTech Inc. ("ShengdaTech" or "The Company") a leading manufacturer of nano precipitated calcium carbonate ("NPCC") and a major manufacturer of coal-based chemical products in Tai'an City, Shandong Province, PRC, today announced it will host a conference call at 9:00 a.m. ET on Tuesday, November 11, 2008, to discuss financial results for the third quarter of 2008. Joining Mr. Xiangzhi Chen, ShengdaTech's Chief...


Latest Calcium carbonate 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_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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