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Decomposed granite is a kind of granite rock that is weathered to the point that the parent material readily fractures into smaller pieces of weaker rock. Further weathering yields material that easily crumbles into mixtures of gravel -sized particles known as grus that further may break down to produce a mixture of clay and silica sand or silt ...
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Exfoliating slabs of granite, on Half Dome in Yosemite National Park, USA. Exfoliating granite is a granite undergoing exfoliation, or onion skin weathering (desquamation).The external delaminated layers of granite are gradually produced by the cyclic variations of temperature at the surface of the rock in a process also called spalling.
In the Alsace Grand Cru AOC of Kastelberg, the soil has metamorphosed with granite sand to form a hard, dark slate-like stone. Terra Rossa – A sedimentary soil known as "Red Earth" that is formed after carbonates have been leached out of limestone. The breakdown leaves behind iron deposits which oxidize and turn the soil a rustic red color.
The Harz granites are part of the Brocken granite complex, which is the largest granite complex in the Harz with an area of 165 square kilometres (64 sq mi). [3] The Harzburg gabbro - norite intrusion forms part of this complex, but has a primary chemistry similar to an island-arc tholeiite , although it shows the effects of large scale ...
The S-type Strathbogie Granite crops out in the Strathbogie Ranges of Australia. A hand sample from the Strathbogie Granite has a porphyritic texture with larger crystal of grey quartz, called phenocrysts, set in a finer grain matrix of quartz and feldspar. The darker, prismatic, phenocrysts in this sample of the Strathbogie Granite are cordierite.
Grus sand and granitoid. Grus is an accumulation of angular, coarse-grained fragments (particles of sand and gravel) resulting from the granular disintegration by the processes of chemical and mechanical weathering of crystalline rocks (most notably granitoids) generally in an arid or semiarid region. [1]
Luxullianite (also known as luxulyanite or luxulianite) is a rare type of porphyritic tournalinized granite, notable for the presence of clusters of radially-arranged acicular tourmaline crystals enclosed by phenocrysts of orthoclase and quartz in a matrix of quartz, tourmaline, alkali feldspar, brown mica, and cassiterite.
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