calcite
From: The Columbia Encyclopedia, Sixth Edition
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Date: 2008
calcite , very widely distributed mineral, commonly white or colorless, but appearing in a great variety of colors owing to impurities. Chemically it is calcium carbonate, CaCO 3 , but it frequently contains manganese, iron, or magnesium in place of the calcium. It crystallizes in the hexagonal system, its crystals being characterized by highly perfect cleavage. 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. One crystalline form, called dogtooth spar because of its dogtooth appearance, exhibits faces of perfect scalene triangles. Another form, satin spar, is finely fibrous and has a satin luster. Iceland spar is clear, transparent calcite. Other important forms of the mineral are limestone , marble , chalk , marl , stalactite and stalagmite formations, travertine , and Oriental alabaster . 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.
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The Columbia Encyclopedia, Sixth Edition 2008
The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press
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... Calcite Hill__ Core length__ Silver grade Hole ... released Mineralization encountered to date at Calcite Hill is zoned. In the upper part, at and ... perhaps stromeyerite (AgCuS) within a gangue of calcite, barite and lesser silica (lower portions of holes 88, 124, 138 and 143). The Calcite Hill ...
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Novel Lube Additive.(Cromption Corp., crystalline calcite sulfonate detergent)(Brief Article)
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Calcite: The Mineral With the Most Forms.(Book Review)
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Calcite: The Mineral With the Most Forms [ILLUSTRATION OMITTED ... have once again created a fine overview, this time, of calcite, the mineral with the most forms. Presumably the appearances ... mineralogical groups ( Tourmaline ) or single species ( Calcite ). Calcite opens with a glance at one of those ...
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Calcite: The Mineral With the Most Forms
Mineralogical Record; 3/1/2005; Moore, Thomas P; 1440 words;
Calcite: The Mineral With the Most Forms Edited by Terry Huizing ... have once again created a fine overview, this time, of calcite, "the mineral with the most forms." Presumably the appearances ... mineralogical groups ("Tourmaline") or single species ("Calcite"). Calcite opens with a glance at one of ...
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MINERALOGY OF THE CALCITE-FLUORITE VEINS NEAR LONG LAKE, NEW YORK.
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Detour Gold Reports Wide Gold Intersections From the Calcite Zone of Its Detour Lake Project in Northern Ontario, Canada ; (2.10 g/t over 76.0 m in DG-07-264 & 2.26 g/t over 69.0 m in DG-07- 259)
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... Detour Gold, commented: "Today's results from the Calcite Zone clearly demonstrate that the Detour Lake ... Concerning Estimates of Mineral Resources This news release uses the terms 'measured', 'indicated ... 380E______171.0__ 190.0____19.0__ 1.27____1.27 Calcite Zone ... 420E______ 65.0____72.0____ 7.0__ ...
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Drilling Continues to Expand Calcite Hill Mineralization at IMA's Navidad Silver Discovery
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... high-grade silver-lead mineralization at Calcite Hill. The Calcite Hill zone is open along strike to the northwest ... Table 1, significant intercepts to date from Calcite Hill include the following ... released results Silver mineralization at Calcite Hill is predominantly hosted within the same ... of ...
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Calcite Twinning Stress Inversion Using OIM (EBSD) Data
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IMA Intersects More Silver NW of Calcite Hill and Prepares to Test the Argenta Trend
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... completed along the northeastern flank of the Calcite Hill Deposit and adjacent to the southern ... silver and lead values were obtained from the Calcite Hill NW Extension Zone centred about 500m to the northwest of the Calcite Hill mineral resource announced on June 16 ... and 2.79% lead from hole 201, both ...
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IMA's Drilling Expands High Grade Silver Mineralization at Calcite Hill-Program Expanded by 10,000 Metres
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... northwest bringing the size of the main portion of Calcite Hill mineralization to approximately 275m ... estimation. Mineralization encountered to date at Calcite Hill is predominantly hosted within trachyandesite ... important style of mineralization consists of calcite-barite veinlets and breccias with ...
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... from 525 to 1,225 metres to the northwest of Calcite Hill where new resources were recently reported ... present over a large area extending from Calcite Hill to the west and northwest. Further drilling ... new holes have been completed to date at Calcite Hill around the peripheries of the Indicated ... holes ...
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