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Danburite

Year of discovery: 1839 (Danbury, USA), 1897 (Japan)

Locality list: 18 localities of danburite

• CaB₂Si₂O₈
• [Ca²⁺][(BSiO₄)₂]^2-

• Class: Danburite group
• Class: Tecto-Borosilicate
• Soluble in: HCl (Slightly)
• Fluorescence: UV excitation (Blue), Thermoluminescence (Red)

• Ca => Ba: Maleevite
• Ca => Sr: Pekovite

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

• Cleavage: Indistinct on {001} (1 plane)
• Hardness: 7-7.5
• Density: 3.0

• System: Orthorhombic
• Group: mmm, Pnam
• Lattice: a=8.0, b=8.8, c=7.7

Etymology: Danbury district, Connecticut, USA