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Lacroixite

Year of discovery: 1914 (Greifenstein Rocks, Germany), 2014 (Japan)

Locality list: A locality of lacroixite

• NaAlPO₄F
• [Na⁺][Al³⁺][F|PO₄]^4-

• Class: Phosphate - Fluoride
• Soluble in: HCl, H₂SO₄

• Na => Li: Amblygonite

• PO₄ => AsO₄: Durangite

• NaAl => Mg₂: Wagnerite
• NaAl => Fe₂:Zwieselite
• NaAl => Mn₂: Triplite
• NaAl => CaMg: Isokite

• Color: Colorless, Pale green
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Poor on {111} (2 planes)
• Hardness: 4.5
• Density: 3.2

• System: Monoclinic, Pseudo-orthorhombic
• Group: 2/m, C2/c
• Lattice: a=6.4, b=8.2, c=6.9, β=115.5