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Datolite (Photo) [abbr. Dat ]

Year of discovery: 1806 (Nødebro mine, Norway), 1902 (Japan)

Locality list: 63 localities of datolite

• CaBSiO₄(OH)
• [Ca²⁺][OH|BSiO₄]^2-

• Class: Datolite group
• Class: Phyllo-Borosilicate - Hydroxide
• Soluble in: HCl (Gel residue)
• Fluorescence: Short UV excitation (Blue)

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

• Habit: Massive

• Cleavage: No
• Hardness: 5-5.5
• Density: 3.0

• System: Monoclinic
• Group: 2/m, P2₁/b
• Lattice: a=9.6, b=7.6, c=4.8, β=90.2

Etymology: Dateisthai (divide) in Greek