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β-Quartz (Photo), High Quartz

Hexagonal pseudomorph of Quartz

Year of discovery: before 1911 (World), 1894 (Japan)

Locality list: 197 localities of β-quartz

• SiO₂
• [Si⁴⁺][O₂]^4-

• Class: Tectosilicate, Oxide
• Phase transition: Transit to Tridymite above 870 degree.
• Phase transition: Formed on transition of heated Quartz above 573 degree.
• Paramorph: Replaced by Quartz.

• Polymorph: Quartz (α) (<573 degree, Trigonal)
• Polymorph: Tridymite (870-1470 degree, Triclinic)
• Polymorph: Cristobalite (>1470 degree, Tetragonal)
• Polymorph: Coesite (2.0-10 GPa, 500-800 degree, Monoclinic)
• Polymorph: Stishovite (>10 GPa, 500-800 degree, Tetragonal)
• Polymorph: Mogánite (Moganite) (Monoclinic)

• Si => Ge: Argutite
• Si => Sn: Cassiterite
• Si => Ti: Rutile, Anatase, Brookite
• Si => Pb: Scrutinyite (α), Plattnerite
• Si => Mn: Pyrolusite (β), Ramsdellite (γ), Akhtenskite (ε)
• Si => V: Paramontroseite
• Si => Mo: Tugarinovite
• Si => U: Uraninite
• Si => Th: Thorianite
• Si => Ce: Cerianite-(Ce)
• Si => Se: Downeyite
• Si => Zr: Baddeleyite
• Si => Te: Tellurite, Paratellurite

• Color: Colorless, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent, Translucent

• Habit: Hexagonal bipyramidal

• Cleavage: No
• Hardness: 7
• Density: 2.5

• System: Hexagonal
• Group: 622, P6₄22
• Lattice: a=5.0, c=5.5