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None of the above, actually. Pyrite is a mineral. Minerals are naturally occurring, inorganic substances. They have a distinctive chemical composition (Pyrite is iron sulfide), a crystalline structure (pyrite can form cubes, although is more often found as an irregular lump), and have distinctive physical properties (such as pyrite's metallic luster, which is why people mistake it for gold). Minerals are what comprise igneous, sedimentary and metamorphic rocks. Pyrite is a mineral, so it is neither igneous, sedimentary, nor metamorphic.

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16y ago

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