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Moganite

Chemical compound
Moganite is an oxide mineral with the chemical formula SiO₂ that was discovered in 1976. It was initially described as a new form of silica from specimens found in the Barranco de Medio Almud, in the ... Wikipedia
Chemical formula: SiO2
Color: Grey
Crystal class: Prismatic (2/m); (same H–M symbol)
Crystal habit: Massive
Crystal system: Monoclinic
Mohs scale hardness: 6
Optical properties: Biaxial