The clay soils containing montmorillonite or smectite ( swelling clays ) are more subject to alkalinity problems than illite or kaolinite clay soils.
22.
Early use of illite crystallinity was in the petroleum industry to determine the transition from a dry gas phase to an unproductive rock.
23.
Black shale results from the presence of greater than one percent carbonaceous material and indicates a chlorite, biotite and illite greens ).
24.
In most sedimentary rocks, mica, feldspar and less stable minerals have been reduced to clay minerals like kaolinite, illite or smectite.
25.
Analysis of the clay mineral illite from a section across the Windermere Supergroup permits an estimate to be made of its maximum burial depth.
26.
Believed to be a degradation product of paragonite, like illite it is a non-expanding, clay-sized, micaceous mineral.
27.
Illite crystallinity can be used to trace the low grade metamorphic transition from zeolite facies to greenschist facies ( diagenetic zone to epizone ).
28.
If the illite crystallinity values fall in the 0-0.25 ?? range, it corresponds with a metamorphic epizone or greenschist facies.
29.
These rocks contain amphibole, clay minerals such as illite, kaolinite and smectite, feldspar, plagioclase, potassium feldspar, pyroxene and quartz.
30.
The drying of the lake left deposits containing amphibole, illite, plagioclase feldspar, potassium feldspar, kaolinite, pyroxene, quartz and smectite.
