Graphite is a soft, crystalline form of elemental carbon. Graphite is a grey to black, opaque mineral with a metallic lustre. It occurs naturally in metamorphic rocks such as marble, schist, gneiss and phyllite. It is usually found as veins, lenses, and pockets and as thin laminae disseminated in metamorphic rocks. Depending on the mode of occurrence and origin, graphite is graded into three forms: flake, crystalline (lumpy) and cryptocrystalline (amorphous).
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Diagnosis is the identification of the nature and cause of a certain phenomenon. It involves two different types of testing method: in vivo and in vitro diagnostics. In vitro diagnostics (IVD) are the medical tests which are intended to perform diagnoses from sample of body fluids in a controlled environment outside a living organism. In vitro diagnostic (IVD) tests are performed to conduct diagnoses from assays in a test tube, or in a controlled environment outside a living organism.
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