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Kyanite is a typically blue aluminosilicate mineral, found in aluminium-rich metamorphic pegmatites and sedimentary rock. It is the high pressure polymorph of andalusite and sillimanite , and the presence of kyanite in metamorphic rocks generally indicates metamorphism deep in the Earth's crust .
The name eclogite is derived from the Ancient Greek word for 'choice' (εκλογή, eklogḗ), meaning 'chosen rock' on account of its perceived beauty. It was first named by René Just Haüy in 1822 in the second edition of his work Traité de minéralogie .
An example is provided by the aluminium silicate minerals, kyanite, andalusite, and sillimanite. All three have the identical composition, Al 2 SiO 5. Kyanite is stable at surface conditions. However, at atmospheric pressure, kyanite transforms to andalusite at a temperature of about 190 °C (374 °F).
Though these documents are of historical interest, they do not detail the daily lives of ordinary people, or the way society functioned. Anthropologists , historians and archeologists generally are more interested in documents that describe the day-to-day lives of ordinary people, indicating what they ate, their interaction with other members ...
The word garnet comes from the 14th-century Middle English word gernet, meaning 'dark ... kyanite, andalusite ... at the U.S. National Museum of Natural History.
It occurs with almandine garnet, micas, kyanite; as well as albite, biotite, and sillimanite in gneiss and schist of regional metamorphic rocks. [7] It is the official state mineral of the U.S. state of Georgia and is also to be found in the Lepontine Alps in Switzerland. Staurolite is most commonly found in Fannin County, Georgia. [8]
Henry's Knob name derives from the Henry family, early settlers of York County who originally owned the mountain and surrounding land. In 1765 William Henry was granted 336 acres (1.36 km 2) on the south side of the Little Mountain, as Henry's Knob was then called, and four years later he was granted another 100 acres (0.40 km 2).
Also eon. age Age of Discovery Also called the Age of Exploration. The time period between approximately the late 15th century and the 17th century during which seafarers from various European polities traveled to, explored, and charted regions across the globe which had previously been unknown or unfamiliar to Europeans and, more broadly, during which previously isolated human populations ...