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Diaspore [abbr. Dsp ]

Year of discovery: 1801 (Mramorskii Zavod, Russia), 1915 (Japan)

Locality list: 173 localities of diaspore

• AlO(OH)
• α-[Al³⁺][OH|O]^3-

• Class: Diaspore group
• Class: Oxide - Hydroxide
• Insoluble in: HCl
• Fluorescence: UV excitation (Pale yellow)

• Polymorph: Böhmite (Bohmite) (γ, Orthorhombic)

• Al => Fe: Goethite (α), Akaganeite (β), Lepidocrocite (γ), Feroxyhyte (δ)
• Al => Mn: Groutite (α), Feitknechtite (β), Manganite (γ)
• Al => V: Montroseite
• Al => Cr: Guyanaite, Bracewellite
• Al => Ga: Tsumgallite
• Al => Co: Heterogenite

• Color: White, Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Habit: Tabular, Acicular

• Cleavage: Perfect on {010} (1 plane), Distinct on {110} (2 planes)
• Hardness: 6.5-7
• Density: 3.4

• System: Orthorhombic
• Group: mmm, Pbnm
• Lattice: a=4.4, b=9.4, c=2.8