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Glauconite pellets and small fossils among quartz grains in greensand from the Dutch Pliocene
Glauconite pellets and small fossils among quartz grains in greensand from the Dutch Pliocene
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Lithium aluminium silicate mineral spodumene
Lithium aluminium silicate mineral spodumene
Diatomaceous earth, a biogenic form of silica as viewed under a microscope. The imaged region measures approximately 1.13 by 0.69 mm.
Diatomaceous earth, a biogenic form of silica as viewed under a microscope. The imaged region measures approximately 1.13 by 0.69 mm.
Nesosilicate specimens at the Museum of Geology in South Dakota
Nesosilicate specimens at the Museum of Geology in South Dakota
Kyanite crystals (unknown scale)
Kyanite crystals (unknown scale)