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Ludwigite (Photo)

Year of discovery: 1874 (Ocna de Fier, Romania), 1923 (Japan)

Locality list: 5 localities of ludwigite

• Mg₂FeBO₅
• [Mg²⁺₂][Fe³⁺][O₂|BO₃]^7-

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

• Polymorph: Magnesiohulsite (Monoclinic), Chestermanite (Orthorhombic), Azoproite (Orthorhombic)

• Mg => Fe: Vonsenite (Series), Hulsite
• Mg => Ni: Bonaccordite

• Fe => Mn: Fredrikssonite, Pinakiolite, Orthopinakiolite, Takéuchiite (Takeuchiite)
• Fe => Al: Aluminomagnesiohulsite

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

• Habit: Acicular

• Cleavage: No
• Hardness: 5
• Density: 3.6

• System: Orthorhombic
• Group: mmm, Pbam
• Lattice: a=9.3, b=12.3, c=3.1