[ Top ] [ Japanese ]

Halloysite-10Å (Photo)

Year of discovery: 1826 (Angleur, Belgium), 1943 (Japan)

Locality list: 73 localities of halloysite-10A

• Al₂Si₂O₅(OH)₄,2H₂O
• [Al³⁺₂][(OH)₄|Si₂O₅]^6-,2H₂O

• Class: Phyllosilicate - Hydroxide - Hydrate
• Soluble in: HCl

• 2H₂O => []: Halloysite-7Å

• Color: White, Pale brown
• Streak: White
• Luster: Earthy
• Diaphaneity: Translucent-Opaque

• Habit: Earthy

• Cleavage: No
• Hardness: 1-2
• Density: 2.6

• System: Monoclinic
• Group: m, Cc
• Lattice: a=5.1, b=8.9, c=10.3, β=100.2

Synonym: Hydrohalloysite, Endellite, Hydrated halloysite