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Tourmaline
Tourmaline
Main tourmaline producing countries
Main tourmaline producing countries
A single stark green fluorite isolated on top of schorl crystals
A single stark green fluorite isolated on top of schorl crystals
Schorl, magnified 10×
Schorl, magnified 10×
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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)