[ Top ] [ Japanese ]

Celadonite (Photo) [abbr. Cel ]

Year of discovery: 1847 (Planitz, Germany, Malga Canalece-San Valentino, Italy, and Tierno-Besagno, Italy), 1942 (Japan)

Locality list: 63 localities of celadonite

• KMgFe³⁺Si₄O₁₀(OH)₂
• K(Mg,Fe²⁺)(Fe³⁺,Al)Si₄O₁₀(OH)₂
• [K⁺][Mg²⁺][Fe³⁺][(OH)₂|Si₄O₁₀]^6-

• Class: Celadonite series, Phengite series < Dioctahedral < True mica group < Mica supergroup
• Class: Phyllosilicate - Hydroxide
• Radioactive: Very weak

• Mg => Fe: Ferroceladonite (Series)

• Fe => Al: Aluminoceladonite (Series)
• Fe => Cr: Chromceladonite

• Mg²⁺Fe³⁺Si⁴⁺ => Al³⁺₃: Muscovite (Phengite Series)

• Color: Bluish green
• Streak: Pale green
• Luster: Earthy
• Diaphaneity: Translucent

• Habit: Earthy

• Cleavage: Perfect on {001} (1 plane)
• Hardness: 2
• Density: 3.0

• System: Monoclinic (1M) (Layer-stacking polytype)
• Group: 2/m, C2/m
• Lattice: a=5.2, b=9.1, c=10.1, β=100.9