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Since the nature of cleavage is dependent on scale, slaty cleavage is defined as having 0.01 mm or less of space occurring between layers. [1] Slaty cleavage often occurs after diagenesis and is the first cleavage feature to form after deformation begins. The tectonic strain must be enough to allow a new strong foliation to form, i.e. slaty ...
Grains of platy minerals, such as clay minerals, are rotated to form parallel layers perpendicular to the direction of compaction, which begin to impart cleavage to the rock. Slaty cleavage is fully developed as the clay minerals begin to be converted to chlorite and mica. Organic carbon in the rock is converted to graphite. [11]
The slatey cleavage typical of slate is due to the preferred orientation of microscopic phyllosilicate crystals. In gneiss, the foliation is more typically represented by compositional banding due to segregation of mineral phases. Foliated rock is also known as S-tectonite in sheared rock masses.
This page is intended to be a list of rock textural and morphological terms. A. Adcumulate; Agglomeritic ... Slaty; slaty cleavage; Specular; Spherulite; Spinifex ...
From a distance, the meta-sedimentary rock is easily mistaken for basalt, which is common in the area, however basalt is not found on Black Mountain. The phyllite has a slaty cleavage and is foliated in all directions, a result of shortening due to pressure-solution volume-diffusion of as much as 50%.
The rock has very irregular slaty cleavage, with tiny muscovite flakes visible in the hand lens. It contains many quartz veins and some limonite augens. Its composition is 50% to 75% quartz and 15% to 30% muscovite with carbonaceous material finely disseminated throughout the quartz and muscovite grains.
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Yorkstone is a tight grained, Carboniferous sedimentary rock. The stone consists of quartz, mica, feldspar, clay and iron oxides. The ratio of quartz to mica varies considerably. The stone can be split along mica-rich layers: it has a slaty cleavage and may therefore be called sandstone slate. [2]