The aluminosilicates are a group of three minerals kyanite, andalusite, and sillimanite which share the chemical formula Al 2 SiO 5.
12.
With increasing temperature and pressure garnet appears, and then kyanite ( at relatively high pressure ) or sillimanite ( at relatively high temperature ).
13.
Explored in 1862, researchers found there a central vault containing a fairly prestigious funerary furniture : axes, pearls, flint tools and sillimanite.
14.
The geology consists mainly of grey or light orange leucogranite and orthogneiss rich in biotite, sillimanite and cordierite with alternating bands of felsic and mafic material.
15.
It produces / sells six heavy minerals namely ilmenite, rutile, zircon, monazite, sillimanite, and garnet as well as various value added products.
16.
Felsic rocks in these terranes contain sillimanite, kyanite, coesite, orthoclase and pyroxene, and are rare, peculiar rocks formed by an unusual tectonic event.
17.
The High Himalayan Crystalline units ( HHC ) are mainly composed of kyanite-to sillimanite-grade gneisses intruded by High Himalayan leucogranites at structurally higher levels.
18.
Ovoid plagioamphibolites are present among schistose plagioamphibolites of the Polmostundrovsky suite and have been dated at ~ 2.6 Ga, indicative of andalusite-sillimanite facies metamorphism.
19.
Among these may be mentioned cordierite and sillimanite gneisses, andalusite and kyanite mica-schists, and those schistose calcite-silicate rocks that are known as cipolins.
20.
Where the schists of sedimentary origin have been pierced by these igneous intrusions, they are charged with contact minerals such as sillimanite, cordierite, kyanite and andalusite.
