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The main rock is limestone - what is the ore inside of it causing the "rust"? It is not magnetic. It has a slight metallic sheen at some angles. These rocks are
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Magnetic susceptibility, its anisotropy, and magnetic carriers of Upper Devonian sedimentary rocks, Latvia | Semantic Scholar
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Anisotropy of magnetic susceptibility (AMS) and diamagnetic fabrics in the Durness Limestone, NW Scotland - ScienceDirect
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