Glauconite sand grains

Glauconite sand grains

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Caption: Plane polarised light micrograph of a thin section of glauconite sand grains from the continental shelf off California. Glauconite is a mineral of marine orgin found in sedimentary deposits of various kinds (sands, as here, sandstones, silts, & impure limestones). It is a thin crytal, characteristically bright green in colour. Mag: X100 (at 35mm size).

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Keywords: california, continental shelf, earth science, geology, glauconite, plm, polarised light micrograph, sand type, usa

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