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Ludlamite

Year of discovery: 1877 (Wheal Jane (Falmouth Consolidated mines), UK), 1910 (Japan)

Locality list: 2 localities of ludlamite

• Fe₃(PO₄)₂,4H₂O
• (Fe,Mg,Mn)₃(PO₄)₂,4H₂O
• [Fe²⁺₃][(PO₄)₂]^6-,4H₂O

• Class: Ludlamite group
• Class: Phosphate - Hydrate
• Soluble in: HCl, HNO₃, H₂SO₄
• Magnetism: Diamagnetic

• Fe => Mn: Metaswitzerite

• 4H₂O => 3H₂O: Phosphoferrite

• Color: Pale green
• Streak: Pale green
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {001} (1 plane), Imperfect on {100} (1 plane)
• Hardness: 3.5
• Density: 3.2

• System: Monoclinic
• Group: 2/m, P2₁/b
• Lattice: a=10.5, b=4.6, c=9.3, β=100.4

Etymology: H. Ludlam (1824-1880), English mineral collector, whoes friend discovered this mineral.