Galena (with Quartz matrix)
Lead Sulfide (Galena) on Silicon Dioxide (Quartz) · Mineral Specimen and Opaque Ore Mineral
Crystal System
Cubic (Isometric) for Galena; Trigonal for Quartz. Habit is typically cubic, octahedral, or massive granular.
Mineral Group
Sulfides (Galena) and Silicates (Quartz - Tectosilicate)
Chemical Formula
PbS (Galena) with SiO2 (Quartz); may contain trace Silver (Ag)
Formation Process
Hydrothermal formation in medium to low-temperature veins, often as a replacement mineral in limestone or dolostone.
About This Crystal
Metallic, lead-gray cubic crystals or granular masses showcasing a bright metallic luster on fresh surfaces. Set within a white to translucent crystalline quartz matrix.
Physical Characteristics
Color: Lead-gray; Streak: Lead-gray to black; Cleavage: Perfect cubic (three directions at 90 degrees); Luster: Metallic; SG: 7.2-7.6 (very heavy).
Optical Properties
Opaque; metallic reflectivity; no birefringence or pleochroism due to cubic symmetry and opacity.
Hardness & Durability
Origin Region
Major deposits in Missouri (USA), Mexico, Morocco, and Germany; typically found in hydrothermal veins.
Hardness & Durability
Mohs hardness 2.5 (Galena) / 7.0 (Quartz). Galena is very brittle and soft; quartz is durable.
Care & Maintenance
Handle with care due to lead content; wash hands after touching. Clean with dry cloth or distilled water; avoid acids and ultrasonic cleaners.
Rarity & Value
Common mineral; value depends on crystal size and geometric perfection. Generally affordable for collectors ($5-$50 for small-medium specimens).
Special Characteristics
High density (notable weight); perfect 90-degree cleavage; can be argentiferous (silver-bearing).
Lore & History
Used since ancient Egypt for kohl eyeliner; primary ore of lead. Traditionally associated with grounding and centering in crystal lore.