A not uncommon cause of the apparently bedded arrangement of layers of different mineralogical composition may be traced to the original differentiation of the granitoid magma into different mineral-sheets.
Wherever the Archean rocks have been closely examined two great groups of rocks are distinguishable, an older, schistose group and a younger, granitoid and gneissic group.
They are dark grey granitoid rocks displaying abundant macroscopic pyroxene crystals 2 to 3 mm.
Footnote 110: I apply the term “diorite” to granitoid rocks formed entirely of plagioclase and hornblende.
This granitoid rock, which is from the Na Kula Ridge, has a specific gravity of 2·72.
They vary considerably in appearance from the open-textured rock to that with a granitoid coarsely crystalline aspect.
Defn: Resembling granite in granular appearance; as, granitoid gneiss; a granitoid pavement.
Examination of the specimens indicates that the material is a fine and somewhat micaceous clay, apparently an adobe derived from granitoid rocks; and such material might be obtained in various parts of Seriland.
The granitoid rocks are found again on the west side of the island of North Somerset, where they form the eastern boundary of Peel Sound.
The sandstone is red, and of the same general character as that which rests upon the granitoid rocks at Cape Warrender and at Wolstenholme Sound.
Yellow and white sandstones are also found in small quantity on the islands, reposing upon the granitoid rocks.
The Silurian rocks of the Arctic Archipelago rest everywhere directly on the granitoid rocks, with a remarkable red sandstone, passing into coarse grit, for their base.
At Wolstenholme Sound the granitoid rocks of Greenland become converted into mica slate and actinolite slate of a remarkable character.
The granitoid rocks extend across Peel Sound into Prince of Wales' Island, in the form of a dark syenite composed of quartz, greenish white felspar passing into yellow, and hornblende.
It is probable that the granitoid rocks appear at the surface somewhat to the eastward of this locality.
These obscurely stratified varieties are commonly known as granitoid gneiss, having the texture and general aspect of granite.
A granitoid variety of rhyolite, common in Nevada.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "granitoid" in a variety of sentences. We hope that you will now be able to make sentences using this word.
