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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.
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/
1974
USA
Graphitte USA carbon frames deserve to be recognized as the first production carbon frame that actually came to market. Frank Appel, Richard Kanter, Bill McCready and Jeffrey Lindskoog of the F.H. Appel Company teamed up for the project. Unfortunately, only 16 of the frames were produced in 1975 before bonding problems surfaced that caused production to cease. Nonetheless, three US National titles were won on these frames and one of them was provided to Lucien Van Impe as a climbing bike. Lineseeker/Graftek, another carbon pioneer, began selling their frames in 1977. Unfortunately, they too had similar structural issues prevent marketing success.
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.