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Mogánite, Moganite [abbr. Mog ]

Year of discovery: 1984 (Mogán, Spain), 1987 (Japan)

Locality list: 5 localities of mogánite

• SiO₂
• [Si⁴⁺][O₂]^4-
• Length-slow Chalcedony of oblique extinction.

• Class: Tectosilicate
• Class: Oxide

• Polymorph: Quartz (α) (<573 degree, Trigonal)
• Polymorph: β-Quartz (β) (573-870 degree, Hexagonal)
• 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)

• 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: Gray
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Habit: Acicular

• Hardness: 6

• System: Monoclinic
• Group: 2/m, I2/a
• Lattice: a=8.8, b=4.9, c=10.7, β=90.1

• Coexist: Quartz

Synonym: Lutecite, Lutecine