why is it, then, that coal is not considered a mineral, but graphite is
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Graphite is a carbon compound with a plate-like atomic structure that differentiates it from diamond, which is a tetrahedral structure from memory. Diamonds are formed at far higher er temps and pressures, and cool relatively quickly given the temperature-pressure required. Graphite is formed in lower crust setting from carbonaceous rocks that might contain coal.
Coal is a mixture of organic compounds. Minerals are the inorganic component of coal, referred to as "ash" because it is residual when burning coal (I. E. Fly ash).
Among the coal compounds called "macerals", there are inertinite, vitrinite and exinite from memory, as well as others. Different macerals have different burning properties that will define the nature of the coal. Each coal will be composed of carbonaceous ooze from the sea floor, trees in a wetland depositional environment or decomposed grass in savannah. These factors decide the volatile gas component like sulphur, hydrogen ET AL. Woody tissue would have different properties after coalification; the heat and pressure event that converts organic residual into coal macerals. This heat and pressure is part of the mountain building that replaces the coal on the surface
Coal is a mixture of organic compounds. Minerals are the inorganic component of coal, referred to as "ash" because it is residual when burning coal (I. E. Fly ash).
Among the coal compounds called "macerals", there are inertinite, vitrinite and exinite from memory, as well as others. Different macerals have different burning properties that will define the nature of the coal. Each coal will be composed of carbonaceous ooze from the sea floor, trees in a wetland depositional environment or decomposed grass in savannah. These factors decide the volatile gas component like sulphur, hydrogen ET AL. Woody tissue would have different properties after coalification; the heat and pressure event that converts organic residual into coal macerals. This heat and pressure is part of the mountain building that replaces the coal on the surface
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because coal is non metal nd graphite is not ..so thats why
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