Galena in Quartz Matrix
Lead Sulfide on Silicon Dioxide (Galena on Quartz) · Mineral Specimen / Metallic Ore Sample
Crystal System
Isometric (Galena) and Trigonal (Quartz). Habit consists of metallic cubic or granular galena embedded in massive or microcrystalline quartz.
Mineral Group
Sulfides (Galena) and Silicates (Quartz - Tectosilicate)
Chemical Formula
PbS (Galena) + SiO2 (Quartz)
Formation Process
Hydrothermal formation in low-to-moderate temperature veins where mineral-rich fluids crystallize in host rock cavities or replace existing minerals.
About This Crystal
The specimen features bright, metallic lead-grey galena grains with a sub-metallic to metallic luster. These are interspersed within a sugary, white-to-translucent quartz matrix that exhibits a vitreous luster.
Physical Characteristics
Color: Lead-grey (Galena) and White/Clear (Quartz); Streak: Lead-grey; Cleavage: Perfect cubic (Galena); Fracture: Conchoidal (Quartz); Specific Gravity: 7.4-7.6 (Galena) vs 2.65 (Quartz); Typically non-fluorescent.
Optical Properties
Galena is opaque with a high metallic reflectance. Quartz is translucent to transparent and doubly refractive (uniaxial positive) with a refractive index of 1.544–1.553.
Hardness & Durability
Origin Region
Prominent in Missouri (USA), Cornwall (UK), and Mexico. Often found in hydrothermal replacement deposits and lead-zinc-silver vein systems.
Hardness & Durability
Galena: Mohs 2.5 (very soft, brittle); Quartz: Mohs 7 (hard). The specimen is fragile due to the softness of the metallic inclusions and the brittleness of the lead sulfide.
Care & Maintenance
Wash hands after handling due to lead content (Galena). Clean with dry brush or room temperature water; avoid ultrasonic cleaners and acids. Store separately from jewelry to prevent lead contamination or scratching.
Rarity & Value
Relatively common mineral association. Value is driven by the size of metallic crystals and contrast against the matrix. Low to moderate price range for collector specimens.
Special Characteristics
Galena is the primary ore of lead and often contains trace amounts of silver (argentiferous galena). It exhibits a characteristic heavy weight (high density) relative to its size.
Lore & History
Historically used as a source of lead and silver for over 5,000 years. Early Egyptians used galena for kohl eyeliner. In metaphysical traditions, it is associated with grounding and centering energies.