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Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
Term or phrase Literal translation Definition and use English pron a fortiori: from stronger An a fortiori argument is an "argument from a stronger reason", meaning that, because one fact is true, a second (related and included) fact must also be true.
Granite (/ ˈ ɡ r æ n ɪ t / GRAN-it) is a coarse-grained intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase.It forms from magma with a high content of silica and alkali metal oxides that slowly cools and solidifies underground.
A page that contains various meanings of a word, and refers to the pages where the various meanings are defined. In cases when there is a prevailing meaning of the term, disambiguation pages are named "subject (disambiguation)" when there is a primary topic. See (Wikipedia:Disambiguation) Disambiguator, disambiguation tag
An impermeable rock stratum which not only obstructs the passage of water but cannot absorb it, e.g. granite. [4] aquitard A bed or layer of rock that slows the conveyance of water from an aquifer due to its low permeability or low hydraulic conductivity. archipelago. Also island chain. A chain, cluster, or collection of islands in a sea. arête
Greisen is formed by self-generated alteration of a granite and is a class of moderate- to high-temperature magmatic-hydrothermal alteration related to the late-stage release of volatiles dissolved in a magma during the solidification of that magma.
Diabase can be cut for use as headstones and memorials; the base of the Marine Corps War Memorial is made of black diabase "granite" (a commercial term, not actual granite). Diabase can also be cut for use as ornamental stone for countertops, facing stone on buildings, and paving. [ 21 ]
Augen gneiss, from the German: Augen, meaning "eyes", is a gneiss resulting from metamorphism of granite, which contains characteristic elliptic or lenticular shear-bound grains (porphyroclasts), normally feldspar, surrounded by finer grained material. The finer grained material deforms around the more resistant feldspar grains to produce this ...