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Vonsenite

Year of discovery: 1920 (Old City quarry, USA), 1953 (Japan)

Locality list: 2 localities of vonsenite

• Fe₃BO₅
• [Fe²⁺₂][Fe³⁺][O₂|BO₃]^7-

• Class: Ludwigite group
• Class: Borate - Oxide
• Soluble in: HCl (Slowly), HNO₃ (Slowly), H₂SO₄ (Slowly)

• Polymorph: Hulsite (Monoclinic)

• Fe => Mg: Magnesiohulsite, Ludwigite (Series), Chestermanite, Azoproite
• Fe => Ni: Bonaccordite

• Color: Black, Greenish black
• Streak: Black, Dark green
• Luster: Silky
• Diaphaneity: Opaque

• Cleavage: No
• Hardness: 5
• Density: 4.7

• System: Orthorhombic
• Group: mmm, Pbam
• Lattice: a=9.5, b=12.3, c=3.1