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.
32.
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.
This sequence can be divided into four main units, as Kyanite-Sillimanite gneiss, pyroxenic marble and gneiss, banded gneiss, and augen gneiss in the ascending order.
35.
For example, kyanite, Al 2 SiO 5 forms from the metamorphism of aluminium-rich shales; it would not likely occur in aluminium-poor rock, such quartzite.
36.
At temperatures above 1100 �C kyanite vitreous silica via the following reaction : 3 ( Al 2 O 3 �SiO 2 ) ?! 3Al 2 O 3 ?SiO 2 + SiO 2.
37.
Henry's Knob, a mountain west of Clover is the site of a former open-pit mining operation for what was formerly the world's largest deposit of kyanite.
38.
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.
39.
Cottage industries are forest-based ( timber, firewood, charcoal, bamboo products ) and mineral-based ( asbestos, coal, chromite, iron ore, mica, and kyanite ).
40.
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.
