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A lustrous crystal of zircon perched on a tan matrix of calcite from the Gilgit District of Pakistan
A lustrous crystal of zircon perched on a tan matrix of calcite from the Gilgit District of Pakistan
Optical microscope photograph; the length of the crystal is about 250 µm
Optical microscope photograph; the length of the crystal is about 250 µm
Sand-sized grains of zircon
Sand-sized grains of zircon
A pale blue zircon gemstone weighing 3.36 carats
A pale blue zircon gemstone weighing 3.36 carats
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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)