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Phlogopite (Photo) [abbr. Phl ]

Year of discovery: 1841 (World), 1926 (Japan)

Locality list: 214 localities of phlogopite

• KMg₃AlSi₃O₁₀(OH)₂
• KMg₃AlSi₃O₁₀(OH,F)₂
• [K⁺][Mg²⁺₃][(OH)₂|AlSi₃O₁₀]^7-

• Class: Biotite series < Trioctahedral < True mica group < Mica supergroup
• Class: Phyllo-Aluminosilicate - Hydroxide
• Variety: Manganophyllite (+Mn)
• Insoluble in: HCl
• Fluorescence: UV excitation (Yellow-Blue)
• Electrical: Electrostatic (Rubbed, Positive)
• Radioactive: Very weak
• Alter to Vermiculite.

• K => Na: Aspidolite

• Mg => Mn: Shirozulite
• Mg => Fe: Annite (Series)
• Mg => Zn: Hendricksite

• Al => Fe: Tetraferriphlogopite

• OH => F: Fluorophlogopite

• KSi => BaAl: => Kinoshitalite

• MgSi => Al₂: Eastonite (Series)

• Mg²⁺₃ => Al³⁺₂: Muscovite

• Color: Brown, Gray, Green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Hexagonal platy

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2-3
• Density: 2.8

• System: Monoclinic (1M, 2M₁), Trigonal (3T) (Layer-stacking polytype)
• Group: 2/m, C2/m
• Lattice: a=5.3, b=9.2, c=10.2, β=100.1