Penetration twins consist of two single crystals that have grown into each other; examples of this twinning include cross-shaped staurolite twins and Carlsbad twinning in orthoclase.
22.
White wrote in a commentary in Nature, " that this staurolite crystal formed within metamorphosed crustal rocks which were subsequently carried into the mantle through subduction ."
23.
Hawthorne then turned his attention to a series of complex crystal-chemistry problems involving rock-forming minerals, such as staurolite, vesuvianite, pyroxenes, beryl, and tourmaline.
24.
Gedrite occurs in contact and medium to high grade metamorphic rocks in association with garnet, cordierite, anthophyllite, cummingtonite, sapphirine, sillimanite, kyanite, quartz, staurolite and biotite.
25.
In central Nepal, the metamorphic grade increases from low ( chlorite + biotite ) to medium ( biotite + garnet + kyanite + staurolite ) towards the MCT over a north-south distance.
26.
To communicate this easily, the dominant metamorphic minerals in schists are usually included in the name, as, for example, garnet schist, or garnet-staurolite schist, and so forth.
27.
A subgroup is the andalusite-, staurolite-, kyanite-and sillimanite-schists which usually make their appearance in the vicinity of gneissose granites, and have presumably been affected by contact metamorphism.
28.
Until the staurolite discovery, no evidence from any kind of rock or gas extruded from the earth's deep interior by volcanoes or other geological action has been so strongly linked to the earth's surface.
29.
Geologists say that staurolite traveling deeper into the earth's interior is usually heated and squeezed until it is further metamorphosed into kyanite and garnet, a hard rock sometimes used as a gem stone that has a deep red color.
30.
The Payzac Quartzite has crossed the staurolite isograd, the Upper Gneiss Unit belongs mainly to the staurolite zone and parts of the Lower Gneiss Unit even have reached the kyanite isograd ( near the village center and in the north ).
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