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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 .
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The stability fields of the Al 2 SiO 5 minerals polymorphs. 1, 2 and 3 are the stability fields of Kyanite, Andalusite and Sillimanite respectively. TP is the triple point, where, theoretically the three aluminosilicates minerals exist in equilibrium.
Eclogite piece from Norway with a garnet (red) and omphacite (greyish-green) groundmass.The sky-blue crystals are kyanite.Minor white quartz is present, presumably from the recrystallization of coesite.
Willis Mountain is a monadnock rising from the rolling Piedmont hills of Buckingham County, Virginia, near the geographic center of the state. It is composed of Kyanite-bearing quartz that weathers more slowly than the surrounding material. [1]
Source: Own work using data from Whitney, D.L. (2002), “Coexisting andalusite, kyanite, and sillimanite: Sequential formation of three Al2SiO5 polymorphs during progressive metamorphism near the triple point, Sivrihisar, Turkey”, in American Mineralogist, volume 87, issue 4, pages 405–416
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).