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Mineralogical Classification Of Igneous Rocks

the mineralogical classification of igneous rocks: a,classification of igneous rocks feldspars, feldspathoids (not including melilite under this term), and primary calcite if there be such a thing. lacroix agrees with the writer in this matter, and so do lincoln and (apparently) grout. but johannsen and niggli use the words 'leucocratic' and 'melano-.igneous rocks: classification of igneous rocks, types of,the mineralogical classification rocks are the most convenient and more accurate method of classification of igneous rocks. when the mineralogical composition of a parent magma and cooling history of the rock. further, minerals in rocks can easily identify and their relative proportions can be ascertained with reasonable accuracy. the bulk of the igneous rocks make up of only a few minerals,.a quantitative mineralogical classification of igneous,classification of igneous rocks 161 characteristic texture of this rock excludes it from representing the family. (2121) ortho-nephelite-syenite, ortho-leucite-syenite. this is nephelite- (or leucite-) syenite without plagioclase. orthofoyaite. see note under (2222). orthoditroite. see note under (2222). orthophonolite..a quantitative mineralogical classification of igneous,classes.-on the basis of the amount of dark minerals (mafites) present, the igneous rocks are divided into four classes, the division points being 0-5-50-95-100 per cent'mafites. ' albert johannsen, 'suggestions for a quantitative mineralogical classification of igneous rocks,' jour. geol., xxv (1917), 63-97. in that paper delete eudialyte,.

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