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  • noun

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any metamorphic rock that can be split into thin layers

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The microcracks, micropores, schistosity, and bedding in the rock quickly closed under the external load.
They display a well-developed schistosity defined by the preferred orientation of muscovite and biotite flakes and crystals of graphite and Fe-Ti oxides.
The macroscopic outline of marine sedimentary rock bedding and foliation, phyllite, and schistosity formed by metamorphism is also planar mainly.
(v) Sandy laminations: presence of sedimentary sand layers which cut the schistosity planes and have a negative effect on fissility.
Crystalline rocks are resistant to weathering and alteration; mica-schists easily discompose on the schistosity plans, but they resist to alteration; sedimentary rocks are attacked by dripping, gully formation, torrentiality and landslides.
These flakes commonly form composite shredded lenses elongate along the schistosity. No other assays have been performed on the core by Archer.
Rocks display cleavage, schistosity and small-scale folds, most of which have northwesterly trending axes (Lynch 1990).
These types of rocks do not have the same schistosity as the schists, that is, they are not liable to fracture along cleavage planes.
The tanzanite deposits occur in the crest of the large Lelatema fold or antiform, which is bounded by major faults parallel to the schistosity. The axes of the productive fold hinges plunge at about 40 degrees, extending progressively deeper from Block A toward Block D.
The lineation is in the plane of the schistosity. Sparse oblique and sub-horizontal open fracturing is usually developed parallel to the lineation/schistosity plane and perpendicular to it (Fig.
Oil shales show distinct lamination and schistosity. Drilling data indicate that the thickness of oil shale sequence is 57-111 m.
It was evidenced already in the paper of Fediukova and Fediuk (1971) that the crystalloblastic growth of sekaninaite in the Zd'arske Chalupy granulite is clearly younger than the origin of the rock foliation (banding and schistosity).
Caption: Figure 3: Geological map of the study area (reproduced and modified from Gazel et al., 1954, under the public domain) with AMT soundings points; field observation showing folds on a schist (a); porphyritic granite (b); schistosity (c); joint tension/dextral shear in granite (d).