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alkalic

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alkalic [‚al′kalĀ·ik]
Also known as alkali.
(petrology)
Of igneous rock, containing more than average alkali (K2O and Na2O) for that clan in which they are found.
Of igneous rock, having feldspathoids or other minerals, such as acmite, so that the molecular ratio of alkali to silica is greater than 1:6.
Of igneous rock, having a low alkali-lime index (51 or less).


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This relationship of high grade gold mineralization as an overprint on a much larger zone of halo gold mineralization is typical of the alkalic gold systems.
The self-corrosion current of Ni-P coating is the least either in acid, alkalic, or salty solutions.
2000), plagioclase (mainly alkalic plagioclase of the anorthite type) appears to be a little more resistant to acid hydrolysis than orthoclase.
 
 
 
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