Rocks foliated

Gneiss coarse grained rocks foliated dark and light bands or layers of aligned minerals... 

Schists fine grained rocks foliated mica minerals, often crinkled or wavy... 

Pavich, M. J. (1986). Processes and rates of saprolite production and erosion on a foliated granitic rock of the Virginia Piedmont. In "Rates of Chemical Weathering of Rocks and Minerals" (S. M. Coleman and D. P. Dethier, eds), pp. 551-590. Academic Press, New York. 

The granitoid pluton is mostly massive, with some isolated off-shoots of the pluton in the east show foliation in the NW-SE direction with moderate dips towards SW (Fig.1), which is parallel to the schistosity of the country-rock metapelites. Pegmatites and pegmatitic quartz veins occur in metasediments, spatially associated with the granites. 

The VMS sulphides define a broadly conformable sheet 5-50 m below the base of the BLUC. This synformal surface of mineralisation generally coincides with the transition from ultramafic cumulates and strongly foliated metavolcanic rocks to an underlying sequence of metavolcanic rocks and interflow metawacke and metasiltstone rocks (Fig. 2). Sphalerite-pyrrhotite mineralisation in hydrothermal veins was also observed within the BLUC several km west of this study area. 

The volcaniclastic rocks hosting the Boomerang massive sulfide show a wide range of petrographic and chemical compositions. Petrographically the HW volcaniclastic rocks show increasing finegrained white mica (muscovite/sericite) development with proximity to the mineralized horizon. The abundance of these phyllosilicates enhances the development of more intense foliation in... 

Automated feature extraction using The Spectral Geologist provides a fast means to obtain abundant and valuable data pertaining to mineral alteration. However, the automated spectral mineral identifications of foliated rocks proved strongly biased towards the phyllosylicates that define tectonic foliations, and were not sufficient to model hydrothermal mineral alteration zoning. 

Foliation Planar features in metamorphic rocks resulting from the parallel alignment of elongated minerals during regional metamorphism. 

Phyllite A fine-grained foliated rock that is more metamorphosed than a slate, but less than a schist. Phyllites have visible sheens from microscopic micas. However, individual mica crystals are not visible with the naked eye. 

Schist A strongly foliated metamorphic rock with visible micas or other platy or linear minerals (compare with slate and phyllite). 

Metamorphic rocks are rich in open foliation fractures and fissures, but these are isolated or poorly interconnected. Such rocks make poor recharge terrains and poor aquifers. These rocks are occasionally fractured by tectonic processes, improving their infiltration and storage properties. 

These rocks show clear cross-cutting relationships with the peridotite foliation and compositional layering (Shervais, 1979 Wilshire et al., 1980). They were generally deformed at high temperature, but only partially transposed into the peridotite... 

Gneiss a foliated rock formed by regional metamorphism (q.v.) in which bands or lenticles of granular minerals alternate with bands and lenticles in which minerals having flaky or elongate prismatic habits predominate. 

Holes were drilled across the joint planes and foliations of the rock mass in the tunnel wall to install borehole extensometers. Conventional... 

TexturaUy, some metamorphic rocks develop a fabric of parallel alignment or orientation of minerals or mineral banding. These are called foliations. Hence metamorphic rocks are divided into two main groups termed foliated or non-foliated on the basis of the presence or absence of this foliation. 

These two groups are then sub-divided with the foliated rocks being classified based on dilferent types of fohation and the non-foliated rocks termed on the basis of their composition. The dilferent types of foliated metamorphic rocks are as found in Table 2.9. 

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