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Pyromorphite (Photo)

Year of discovery: 1813 (Zschopau, Germany), 1891 (Japan)

Locality list: 84 localities of pyromorphite

• Pb₅(PO₄)₃Cl
• [Pb²⁺₅][Cl|(PO₄)₃]^10-

• Class: Apatite group - Apatite supergroup
• Class: Phosphate
• Soluble in: HNO₃, KOH
• Insoluble in: HCl
• Fluorescence: UV excitation (Yellow)
• Electrical: Piezoelectric (Biaxisal crystal)
• Alter to Vauquelinite.
• Substitution pseudomorph: Replace Cerussite or Galena.
• Substitution pseudomorph: Replaced by Cerussite, Plumbogummite, or Galena.

• Pb => Ca: Chlorapatite
• Pb => Ba: Alforsite

• Pb => Ca₂Pb₃: Phosphohedyphane (Series)

• PO₄ => AsO₄: Mimetite (Series)
• PO₄ => VO₄: Vanadinite

• Cl => OH: Hydroxylpyromorphite (Series)

• Color: Green, Dark green, Yellow, Purple
• Streak: White
• Luster: Resinous
• Diaphaneity: Transparent-Translucent

• Habit: Hexagonal prismatic

• Cleavage: Indistinct on {1011} (3 planes)
• Hardness: 3.5-4
• Density: 7.0

• System: Hexagonal
• Group: 6/m, P6₃/m
• Lattice: a=10.0, c=7.3

Etymology: Pyr (Fire) -morphe (form) in Greek