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Warwickite

Year of discovery: 1838 (Warwick, USA), 1956 (Japan)

Locality list: A locality of warwickite

• Mg₃TiB₂O₈
• (Mg,Fe)₃TiB₂O₈
• [Mg²⁺₃][Ti⁴⁺][O₂|(BO₃)₂]^10-

• Class: Neso-Borate - Oxide
• Soluble in: H₂SO₄ (Decompose)

• MgTi => Fe₂: Yuanfuliite

• Color: Dark brown, Gray
• Tarnish: Dull black, Yellow (by weathering)
• Streak: Bluish black
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {100} (1 plane)
• Hardness: 3-4
• Density: 3.4

• System: Orthorhombic
• Group: mmm, Pnam
• Lattice: a=9.2, b=9.4, c=3.1