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Caption: Talc. Section through a sample of talc (or talcum) showing its layers. Talc, hydrous magnesium silicate, is the softest known mineral and is number 1 on the Mohs hardness scale. When ground up into fine particles, it is sold as 'talcum powder' and used as a drying agent. Talc is usually massive or 'foliated' (in sheets) and has a pearly luster and a 'soapy' or greasy feel.

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Keywords: close-up, detail, drying agent, earth science, geological, geology, hydrous magnesium silicate, layer, layered, layers, luster, metamorphic, mineral, mineralogy, minerals, pearly lustre, sample, section, sectioned, silicate, soft, softest, specimen, talcum

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