| In this case the surrounding sediment matrix is dominated by detrital quartz and illite along with various other clay minerals. |
| However, in 30 years, nothing about our illite green clay has changed, and it goes on being extracted from the same quarry! |
| Some of the important clay minerals are kaolinite, halloysite, montmorillonite, illite, vermiculite, and chlorite. |
| The clay is basically of illite and montmorillonite, which retain potassium, thus regulating the plant's uptake of the mineral. |
| Common clays are usually mixtures of clay minerals such as illite, smectite, and kaolinite, together with fine silica and other minor constituents. |
| The fine-grained sediment of the matrix is composed chiefly of siderite, with lesser amounts of illite, calcite, quartz, and bitumen. |
