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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 ...
The rest of the foundation was then constructed of bluestone gneiss rubble and spalls, with every crevice filled with lime mortar. [ 18 ] : 23, 68 The dimensions of this old foundation were 23 feet 4 inches (7.1 m) high, 80 feet (24.4 m) square at the base, and 58 feet 6 inches (17.8 m) square at the top, laid down in eight steps, similar to a ...
The granite of the dimension-stone industry along with truly granitic rock also includes gneiss, gabbro, anorthosite and even some sedimentary rocks. Natural stone is used as architectural stone (construction, flooring, cladding, counter tops, curbing, etc.) and as raw block and monument stone for the funerary trade.
The hornblende gneiss member is similar to the layered gneiss member, but with hornblende-bearing dark gneiss accounting for about half of the outcrop area. [1] The Slaughterhouse Gneiss weathers to a pinkish to orange color, and consists of relatively uniform, medium-grained microcline-quartz-plagioclase gneiss with muscovite, biotite, or both ...
Graywackes and metamorphosed gneiss are seen in the sedimentary rocks at the base of the formation. These graywackes and gneiss contain angular grains are quartz and feldspar can be found in the gneiss with a matrix of chlorite and sericite. Farther below the metamorphosed gneiss contains more large quartz and feldspar with little matrix. [1]
Banded gneiss with dike of granite orthogneiss; competent banded gneiss is boudinaged by ductile shear. Boudin on the Island of Uto, Stockholm Archipelago, Sweden Chocolate-tablet boudinage structures in a low grade metasedimentary rock outcropping in Deception Pass, Washington
Polished pietersite. Pietersite is a commercial term for a variety of the mineral chalcedony.Originating from Namibia and China, where it is mined for use as a decorative stone due to its chaotic chatoyancy and brecciated structure.
Geological map of the Hebridean terrane showing distribution of rocks of the Lewisian complex Undeformed Scourie dyke cutting Lewisian Gneiss, about 1.6 km west of Scourie Scourie dykes (now foliated amphibolites) cutting grey gneiss of the Scourie complex, both deformed during the Laxfordian tectonic event and cut by later (unfoliated) granite veins - road cutting on the A838 just north of ...