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Allophane (Photo)

Year of discovery: 1816 (Gräfenthal, Germany), 1935 (Japan)

Locality list: 72 localities of allophane

• (Al₂O₃)(SiO₂)_1.3-2,2.5-3H₂O
• [Al³⁺₂O₃][(Si⁴⁺O₂)_1.3-2],2.5-3H₂O

• Class: Allophane group
• Class: Phyllo-Aluminosilicate - Oxide - Hydrate
• Soluble in: HCl (Gel residue)
• Fluorescence: Short UV excitation (Blue)
• Variety: Cupro-Allophane, Cuprian Allophane (+Cu, Blue)

• Color: White, Gray
• Streak: White
• Luster: Waxy
• Diaphaneity: Transparent

• Aggregate: Stalactic

• Cleavage: No
• Hardness: 3
• Density: 1.9

• System: Amorphous

Etymology: Allos (other) - phanos (appear) in Greek.