Limonite with Pyromorphite
Goethite/Limonite with Pyromorphite (Pb5(PO4)3Cl) · Mineral Specimen / Collector Mineral
Crystal System
Hexagonal (Pyromorphite) / Amorphous or Orthorhombic (Limonite)
Mineral Group
Oxides / Phosphates (Apatite group)
Chemical Formula
FeO(OH)·nH2O (Limonite matrix) / Pb5(PO4)3Cl (Pyromorphite crystals)
Formation Process
Secondary oxidation zone of lead-bearing ore deposits (Hydrothermal/Oxidation)
About This Crystal
Earthly brown, opaque limonite gossan matrix featuring crusts of small, bright apple-green to olive-green crystals with resinous to sub-adamantine luster.
Physical Characteristics
Streak: Brown (matrix), White (crystals); Cleavage: None visible; Specific Gravity: 2.7-4.3 (matrix), 6.5-7.1 (crystals); Fracture: Uneven to conchoidal.
Optical Properties
High Refractive Index (2.04 - 2.06); Doubly refractive (Uniaxial negative); Non-pleochroic in these small specimens.
Hardness & Durability
Origin Region
Bunker Hill Mine (Idaho, USA) or Daoping Mine (Guangxi, China)
Hardness & Durability
Pyromorphite: 3.5 - 4 on Mohs scale; Limonite: 4 - 5.5. Brittle tenacity, unsuitable for jewelry wear.
Care & Maintenance
Avoid acidic cleaners or ultrasonic cleaning. Handle with care due to lead content; wash hands after touching. Store in a dry environment.
Rarity & Value
Common to Uncommon; values determined by the vibrancy and coverage of the green pyromorphite crystals against the matrix.
Special Characteristics
Secondary lead mineral formation; may show weak fluorescence under UV; distinctive barrel-shaped or acicular habit in higher quality clusters.
Lore & History
Historically important as a lead ore indicator. Metaphysically associated with the heart chakra and intended for clearing energetic blockages.