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Graftonite

Year of discovery: 1900 (Melvin Mountain, USA), 1980 (Japan)

Locality list: A locality of graftonite

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

• Class: Phosphate
• Soluble in: HCl, HNO₃, H₂SO₄
• Substitution pseudomorph: Replaced by Heterosite.

• Polymorph: Sarcopside

• Fe => Mn: Beusite

• Color: Reddish brown
• Tarnish: Dark brown
• Streak: Pale red
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Good on {010} (1 plane), Poor on {100} (1 plane)
• Hardness: 5
• Density: 3.7

• System: Monoclinic
• Group: 2/m, P2₁/c
• Lattice: a=8.9, b=11.6, c=6.2, β=99.2