schistosity


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schistosity

[shis′täs·əd·ē]
(geology)
A type of cleavage characteristic of metamorphic rocks, notably schists and phyllites, in which the rocks tend to split along parallel planes defined by the distribution and parallel arrangement of platy mineral crystals.
References in periodicals archive ?
The amphibolites have a well-developed schistosity with a N31[degrees]E/52NW trend.
Anthophyllite schists are restricted to hornblende schists, and they appear as anastomosed irregular lenses, with thicknesses between 4 and 11 cm, composed of translucent and fibrous minerals parallel to schistosity (Figure 2i).
1]) is indicated by schistosity (it is dipping to the west).
2]) is manifested in all the rocks by the folding of schistosity, which is macroscopically observed (see Figures 2f and 2h).
It is characterized by a strong southward-dipping schistosity and is bounded on both sides by southward-dipping faults, which Sutherland-Brown and Robinson (1971) suggest are en-echelon in character.
Primary bedforms in the zone have been obliterated, except for small fragments of beds that lie sub-parallel to schistosity.
1]) produced a strong west-northwest trending, steeply southward dipping schistosity ([S.
The shear zone is transected by a number of late faults, many of which are subparallel to the schistosity and margins of the shear zone.
The fracturing of the rock is strongly connected to the schistosity and the main fracture systems are formed parallel and perpendicular to it.
The knowledge of the structural features of soapstone was emphasized, since the measurements showed also the lineation and schistosity of the rock.
Oil shales of the field are brown, gray and greenish, and they display distinct lamination and schistosity.
The oil shales are dark brown--black and show distinct lamination and schistosity.