Tridymite
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Tridymite is a high-temperature polymorph of silica and usually occurs as minute tabular white or colorless pseudo-hexagonal crystals, or scales, in cavities in felsic volcanic rocks. Its chemical for
Tabular tridymite crystals from Ochtendung, Eifel, Germany
Silicate mineral
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Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of minerals and make up approximately 90 percent of Earth's crust.
Tridymite
…Tridymite Tabular tridymite crystals from Ochtendung, Eifel, Germany General Category Tectosilicate minerals Group Quartz group Formula SiO2 IMA symbol Trd Strunz classification 4.DA.10 Crystal system Orthorhombic (α-tridymite) Crystal class Disphenoidal…
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.
Nesosilicate specimens at the Museum of Geology in South Dakota
Kyanite crystals (unknown scale)