A synthetic phase.
See birnessite
A synthetic phase.
See birnessite
See plagioclase feldspar.
Stoops and Jongerius (1975) differentiated five characteristic types (e.g., fabrics) of soil and palustrine deposits based on coarse (c) and fine (f) or clay particles: monic, gefuric, cithonic, enaulic, and porphyric. The c/f related distribution is therefore the relationship between ground mass (matrix) and a general framework of coarser components (e.g. grains, aggregates). The different descriptions of the classifications, however, are not mutually exclusive:
– cithonic c/f-related distribution : A distribution where fine-grained material forms a wrap over the coarser skeletal components. Any orientation of the clay particles in the wrap or cover are not considered important in the definition.
– enaulic c/f-related distribution : A distribution where there is a framework of grain- supported skeletal components with partial infillings of fine grained materials and pore spaces.
– gefuric c/f-related distribution : The distribution involves fine-grained material connecting coarser components, where coarse material is not in direct contact with other coarse components.
– monic c/f-related distribution : This distribution consists of predominantly one size group, including all ground mass, amorphous material or skeletal components.
– porphyric c/f-related distribution : The distribution of generally coarse components within a ground mass of fine-grained material.
An obsolete varietal term for biotite.
See reyerite group.
See cutan.
To heat a substance to a temperature where it dissociates, for example the heating of calcite (CaCO3) to form CaO and CO2. If clay is calcined, hydroxyl groups are removed from structural constituents and plasticity is destroyed.