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.
22.
Among the minor minerals, there are quartzite reserves in the Nagaon district, kaolin reserves in Karbi Anglong and the Lakhimpur districts and sillimanite-bearing rocks in Karbi Anglong district.
23.
This is usually related to the metamorphic temperatures of pelitic or aluminosilicate rocks and the minerals they form . The metamorphic grades of aureoles are andalusite hornfels, sillimanite hornfels, pyroxene hornfels.
24.
It occurs as argillaceous inclusions in volcanic rocks in the Isle of Mull, inclusions in sillimanite within a tonalite at Val Sissone, Italy and with emerylike rocks in Argyllshire, Scotland.
25.
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.
26.
The associated minerals with khamralite ( sillimanite, surinamite, musgravite, garnet, and biotite ) saturated it in BeO, allowing the BeO content to be close to the maximum possible.
27.
The aluminosilicates kyanite, andalusite, and sillimanite, all Al 2 SiO 5 are structurally composed of one [ SiO 4 ] 4 " tetrahedron, and one Al 3 + in octahedral coordination.
28.
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.
29.
These granites, which are collectively called the " Gold Butte Granite ", intrude garnet-cordierite-sillimanite and hornblende gneisses, migmatites, and older granites, pyroxenites, and hornblendites.
30.
In central Nepal, the upper Formation III consists of augen orthogneisses, whereas the Middle Formation II are calcsilicate gneisses and marbles, and the basal Formation I are kyanite-and sillimanite bearing metagreywacke with abundant quartzite.
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