dacite
dacite A light-coloured, fine-grained
igneous rock containing 63–70 wt.% SiO
2, as well as
plagioclase feldspar,
alkali feldspar,
quartz,
biotite, and
hornblende as
essential minerals, and
sphene,
apatite, and
magnetite as
accessory minerals. Plagioclase feldspar dominates over alkali feldspar in a 2:1 ratio. Dacites are the volcanic equivalents of
granodiorites and are found as members of the
calc-alkaline series, typically developed as eruptive products on the continental side of oceanic-continental
plate subduction zones. They are often surprisingly coarse-grained for lavas.
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Mica
Magazine article from: Mining Engineering; 6/1/2002; ; 700+ words
; The mica group represents 34 different phyllosilicate minerals that...structure. Muscovite and phlogopite are the commercially important mica minerals. Muscovite is the principal mica used. It is more abundant than phlogopite, has white color...
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MICA
Magazine article from: Mining Engineering; 6/1/2004; ; 700+ words
; The mica group represents 34 phyllosilicate minerals that exhibit...layered or platy structure. Commercially important mica minerals are muscovite and phlogopite. Muscovite is the principal mica used. It is more abundant, is white and has superior...
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Mica: strength and sheen.
Magazine article from: Paint & Coatings Industry; 5/1/2003; ; 700+ words
; ...illustrated in Figure 1. [FIGURE 1 OMITTED] Mica is well-known for its ready delamination...muscovite plates. [FIGURE 2 OMITTED] Mica Grades Fillers Most filler and pigment grade micas are derived from flake mica, which is collected by the centrifugation...
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MICA Ranked Among Top Four Nationally By U.S. News & World Report In 2008-09 Best Graduate Schools Edition
News Wire article from: Targeted News Service; 11/11/2008; 700+ words
; ...release: Maryland Institute College of Art MICA's Master of Fine Arts programs were ranked...universities, according to the magazine. MICA was nominated for inclusion in the survey...excellence" in the area of fine arts. MICA has long been recognized as one of the...
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MICA Defeats Year 2000 Menace
PR Newswire; 11/4/1996; 700+ words
; ...Texas, Nov. 4 /PRNewswire/ -- MICA Accounting Software has announced the availability of Release 3.00 of its MICA IV accounting software -- software that...Chris Oliver, director of marketing for MICA. "Furthermore, many of the companies...
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MICA Faculty, Alumni Receive Individual Artist Awards From Maryland State Arts Council
News Wire article from: Targeted News Service; 3/6/2009; 597 words
; ...A number of Maryland Institute College of Art's (MICA) distinguished faculty and alumni are the recipients...Faculty winners are Susie Brandt (http://www.mica.edu/About_MICA/Administration_Faculty_Leadership/Faculty...
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MICA Unveils MICA IV Release 3.00; New Features Enhance Popular, Award-Winning Accounting Software
PR Newswire; 10/3/1996; 700+ words
; ...Release 3.00 of its popular, award-winning MICA IV software for small to medium-sized businesses, MICA Accounting Software remains true to its commitment...many enhancements we have added ensure that MICA IV can confidently be used to run a business...
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Mica: NCUA Lacks Vision For Future.(Daniel Mica on the Credit Union National Administration)(Brief Article)
Magazine article from: Credit Union Journal; 10/9/2000; ; 700+ words
; CUNA President Dan Mica pulled few punches in remarks last week critical of NCUA...Amours. In remarks before the trade group's SymposEum that Mica had called a "policy" speech, Mica said the agency's leadership does not have the "vision...
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"A" mica.(Word to the Wise)
Magazine article from: Rocks & Minerals; 5/1/2006; ; 700+ words
; ...to peel layers from a specimen of scrap mica. It is simply fun to do, perhaps because...uncommon combination of properties found in mica. It is the same reason that Silly Putty...well as the strength within a layer of mica are all physical properties that allow...
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Reportlinker Adds World Mica Market Report.
Business Wire; 3/24/2009; 700+ words
; ...research report is available in its catalogue. World Mica Market http://www.reportlinker.com/p098325/World-Mica-Market.html This report analyzes the worldwide markets for Mica in Metric Tons. The specific product segments analyzed...
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mica
Book article from: The Columbia Encyclopedia, Sixth Edition
...crystallize in the monoclinic system, but mica is most commonly found in the form of scales and sheets. All the micas have an excellent basal cleavage, splitting...important micas are muscovite (potassium mica) and phlogopite (magnesium mica...
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micas
Book article from: A Dictionary of Earth Sciences
micas An important group of phyllosilicates (sheet silicates) with a 2...4 , where Y = Mg, Fe, Fe 3+ , or Al, and Z = Si or Al; the micas include the common micas already mentioned, plus glauconite , lepidolite , and zinnwaldite...
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hydrous mica
Book article from: A Dictionary of Plant Sciences
hydrous mica ( illite ) See CLAY MINERALS .
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Carolina Micaëlis de Vasconcelos
Book article from: The Columbia Encyclopedia, Sixth Edition
Carolina Micaëlis de Vasconcelos , 1851-1925, Portuguese scholar, b. Berlin. As a youth she gained a considerable reputation as...
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margarite
Book article from: A Dictionary of Earth Sciences
...has the typical appearance of mica, but is much harder than common mica types. Cleavage sheets are...elastic than those of the common micas and hence margarite is a member of the ‘brittle mica’ group. At one time...
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