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porphyritic rock

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Noun1.porphyritic rock - any igneous rock with crystals embedded in a finer groundmass of mineralsporphyritic rock - any igneous rock with crystals embedded in a finer groundmass of minerals
porphyry
groundmass - (geology) the matrix of fine-grained crystalline material in which larger crystals are embedded
igneous rock - rock formed by the solidification of molten magma
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The quartz monzonitic rocks in the southern part of the Riga batholith are brownish, mostly coarse-grained porphyritic rocks containing megacrysts of euhedral, mesoperthitic alkali feldspar.
Anorogenic magmatic rocks in the Estonian crystalline basement/Eesti ... by Kirs, Juho; Haapala, Ilmari; Ramo, O. Tapani / Proceedings of the Estonian Academy of Sciences: Geology
At Cajatambo, gold-silver mineralization occurs in altered Tertiary porphyritic rocks over an area at least 3.
Solitario Exploration & Royalty Updates 2010 Exploration Plans by Business Wire
One of these boulders, (A quartz-feldspar porphyritic rock with disseminated MoS2,) which are typically angular, and up to 50 kilograms in weight, was recently assayed and returned an analysis of 7.
Newmac Resources Inc.: Fox Molybdenum Project Review by Business Wire
 
 
 
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