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Trachytoid

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Trach´y`toid
a.1.(Min.) Resembling trachyte; - used to define the structure of certain rocks.


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The stocks of the porphyritic K-granites in the Estonian mainland show up as small gravity and magnetic minima (Ereda, Neeme, Naissaare, Taebla, and Kloostri stocks) and comprise pink, medium- to coarse-grained, microcline-megacrystic, partly trachytoid biotite (in Marjamaa and Naissaare also biotitehornblende) syeno- and monzogranitic rock, locally cut by aplitic and microsyenitic dykes (Kuuspalu 1975; Kirs 1986; Soesoo & Niin 1992).
The potassium granites from the stocks typically comprise pink, medium- to coarse-grained, microcline-megacrystic, massive, partly trachytoid syeno- and monzogranitic rocks, which are locally cut by aplitic and microsyenitic dykes (Kuuspalu 1975; Kirs 1986; Soesoo & Niin 1992).
 
 
 
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