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Phyllite Photomicrograph of thin section of phyllite (in cross polarised light) Fractured Duke stone showing phyllitic texture Phyllite. Phyllite (/ ˈ f ɪ l aɪ t / FIL-yte) is a type of foliated metamorphic rock formed from slate that is further metamorphosed so that very fine grained white mica achieves a preferred orientation. [1]
Slate can be made into roofing slate, a type of roof tile which are installed by a slater. Slate has two lines of breakability—cleavage and grain—which make it possible to split the stone into thin sheets. When broken, slate retains a natural appearance while remaining relatively flat and easy to stack.
The formation was originally designated as the Hondo Slate by Evan Just in his 1937 survey of pegmatites in northern New Mexico. [5] However, this name conflicted with other unit names, and it was renamed the Pilar Phyllite Member of the Ortega Formation by Arthur Montgomery in 1953 [6] Bauer and Williams promoted it to formation rank within the Vadito Group in their sweeping revision of the ...
A flame-bladed sword or wave-bladed sword has a characteristically undulating style of blade. The wave in the blade is often considered to contribute a flame-like quality to the appearance of a sword. The dents on the blade can appear parallel or in a zig-zag manner. The two most common flame-bladed swords are rapiers or Zweihänders. A flame ...
The following is a list of rock types recognized by geologists.There is no agreed number of specific types of rock. Any unique combination of chemical composition, mineralogy, grain size, texture, or other distinguishing characteristics can describe a rock type.
Schistosity is a thin layering of the rock produced by metamorphism (a foliation) that permits the rock to easily be split into flakes or slabs less than 5 to 10 millimeters (0.2 to 0.4 in) thick. [ 4 ] [ 5 ] The mineral grains in a schist are typically from 0.25 to 2 millimeters (0.01 to 0.08 in) in size [ 6 ] and so are easily seen with a 10 ...
Oakeshott's sword descriptions orient them with the point as the bottom and the hilt at the top. This was inspired by his observation that many blades bearing inscriptions and crests had to be oriented this way to be read correctly. [1] Different blade cross-sections. At the top, variants of the diamond shape.
Peridotite, a type of ultramafic rock. Ultramafic rocks (also referred to as ultrabasic rocks, although the terms are not wholly equivalent) are igneous and meta-igneous rocks with a very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are usually composed of greater than 90% mafic minerals (dark colored, high magnesium and iron content).