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Graphite schist (4.2 centimeters across at its widest)
Metamorphic rocks result from intense alteration of any previously existing rocks by heat and/or pressure and/or chemical change. This can happen as a result of regional metamorphism (large-scale tectonic events, such as continental collision or subduction), burial metamorphism (super-deep burial), contact metamorphism (by the heat & chemicals from nearby magma or lava), hydrothermal metamorphism (by superheated groundwater), shear metamorphism (in or near a fault zone), or shock metamorphism (by an impact event). Other categories include thermal metamorphism, kinetic metamorphism, and nuclear metamorphism. Many metamorphic rocks have a foliated texture, but some are crystalline or glassy.
Schist is an intermediate- to high-grade, foliated metamorphic rock. It is highly variable in appearance, depending on the mineral content, which is a function of the precursor rock and specific temperature-pressure conditions. Garden-variety schists form by metamorphism of phyllites. Schists typically have medium- to large-sized crystals, unlike the microcrystalline nature of slate & phyllite.
Schist's foliated texture (= crystals aligned into bands or stripes or layers) is often only seen when specimens are viewed on edge.
Graphite schist forms by intermediate- or higher-grade metamorphism of coal. This results in a foliated rock dominated by the mineral graphite (C - carbon). Graphite schist has a metallic luster, silvery-gray color, a slick and greasy feel, is very soft (H = 1), and easily marks paper.
(india ink, graphite and gesso on canvas) --- --- --- Agnes Bernice Martin RCA (March 22, 1912 – December 16, 2004) was an American abstract painter known for her minimalist style and abstract expressionism. Born in Canada, she moved to the United States in 1931, where she pursued higher education and became a U.S. citizen in 1950. Martin's artistic journey began in New York City, where she immersed herself in modern art and developed a deep interest in abstraction. Despite often being labeled a minimalist, she identified more with abstract expressionism. Her work has been defined as an "essay in discretion, inwardness and silence."
Growing up in rural Canada and influenced by the New Mexico desert, where she lived for the last several decades of her life, Martin's art was characterized by serene compositions featuring grids and lines. Her works were predominantly monochromatic, employing subtle colors like black, white, and brown. Martin's minimalist approach conveyed tranquility and spirituality, and her paintings often carried positive names reflective of her philosophy. (Wikipedia)
Viajando em um desenho mais surreal. Grafite sobre canson A3.
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Drawing surreal. Graphite on canson paper size A3.
Graphite portrait on paper.
This drawing of a friend came about as a result of the lessons learned in the series of blind contours.
(See Nicolette: www.flickr.com/photos/elizabeth_rice/8706616918/in/photos...) It was a wonderfully satisfying drawing to complete.
Nuclear heat sources for the Mars Science Laboratory’s radioisotope power system were assembled into high-strength graphite impact shells at Idaho National Laboratory.
Learn more about this project and view NASA's Curiosity videos at www.inl.gov/marsrover/
Drawn entirely freehand with 4b and 5b pencils. This took about an hour. Please give constructive criticism.
Part of the MCLI server tour, meet Graphite, a 600 MhZ Pentium III running Fedora. This server runs the weblogs, wikis, and discussion boards that the are "small peces" supporting our Ocotillo projects.
Note the old Mac style big bubble monitor.