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Other minerals in the group may have a platy habit.
The platy bark is dark brown or black.
It is platy (made in plates like mica) and fragile.
These hard layers often have platy structure and resist easy penetration by water or plant roots.
In platy structure, the units are flat and platelike.
The clade is characterized by having an intersected crossed platy shell structure.
One of their main characteristics is the presence of intersected crossed platy shell structure.
This occurs particularly on platy minerals, especially micas.
Clay minerals are mostly hydrous alumino-silicates with a platy crystal structure.
The platy texture acts as an antiblocking, antisticking agent.
It usually occurs as black platy aggregates.
The typical habit is platy or tabular pseudohexagonal cyclic twinned crystals.
This refers to the ease with which schists can be split along the plane in which the platy minerals lie.
The mica group represents 37 phyllo silicate minerals that have a layered or platy texture.
The chemistry, thickness and stacking arrangement of these platy crystals strongly influences the properties of clay.
It occurs as radial discoidal, platy hexagonal crystals, in rough spherules up to 1mm thick.
The shell structure of Tuarangia is noted for being composed of platy calcite sections in a zig-zag patterning.
Continuous or penetrative cleavage describes fine grained rocks consisting of platy minerals evenly distributed in a preferred orientation.
The growth of platy minerals, typically of the mica group, is usually a result of prograde metamorphic reactions during deformation.
The fundamental feature of slate is the cleavage, which results from well-crystallised platy clay minerals arranged along a single set of micron-spaced parallel planes.
S-planes or schistosity planes are parallel with the shear direction and are generally defined by micas or platy minerals.
It is a gray-green shale that contains beds of platy limestone conglomerate along with fossils of trilobites and brachiopods.
The more completely altered forms of these rocks are platy, green chloritic schists; in these, however, structures indicating their original volcanic nature only sparingly occur.
It is a soft, colorless to pale yellow or green earthy mineral which crystallizes in the monoclinic system as minute tabular to platy crystals.
S-planes or schistosité planes are generally defined by a planar fabric caused by the alignment of micas or platy minerals.