Galena
Galena (Lead Sulfide) · Mineral Specimen / Industrial Metal Ore
Crystal System
Cubic (Isometric) system; commonly occurs in cubic, octahedral, or dodecahedral habits. This specimen displays a massive and granular habit with distinct cubic cleavage planes visible.
Mineral Group
Sulfides (Galena group)
Chemical Formula
PbS (Lead Sulfide), often containing silver (Ag), zinc (Zn), or copper (Cu) as trace impurities.
Formation Process
Hydrothermal formation within medium to low-temperature veins; also occurs in contact metamorphic deposits and as a replacement in carbonate rocks (sedimentary-exhalative).
About This Crystal
An opaque mineral with a bright metallic luster and lead-gray to silver color. It shows heavy, massive texture with micro-crystalline surfaces that reflect light intensely. The surface appears somewhat weathered or oxidized with a dull brownish-gray matrix typical of raw ore specimens.
Physical Characteristics
Color: Lead gray; Streak: Lead gray to black; Luster: Bright metallic; Cleavage: Perfect cubic (3 planes at 90 degrees); Fracture: Subconchoidal or uneven; Specific Gravity: 7.2–7.6 (very heavy); Magnetism: None; Fluorescence: None.
Optical Properties
Opaque (does not transmit light); Isotropic (singly refractive); displays a very high metallic reflectivity.
Hardness & Durability
Origin Region
Prominent sources include Missouri (USA), Mexico, Australia, Bulgaria, and Cornwall (UK). Typically found in hydrothermal veins and sedimentary environments.
Hardness & Durability
Mohs hardness of 2.5–2.75. It is quite soft and brittle, easily scratched by a copper penny or a knife. Low toughness creates a risk of crumbling if dropped.
Care & Maintenance
Wash hands after handling due to lead content. Clean only with a dry cloth or soft brush; avoid acids. Store in a cool, dry place away from children and pets. Due to high density and softness, keep separate from harder stones to prevent scratching.
Rarity & Value
Very common mineral; value is generally low for massive specimens but higher for well-formed cubic crystals. Primarily valued as the primary ore of lead and a significant silver source.
Special Characteristics
Notable for its exceptional density (high specific gravity) and perfect cubic cleavage which allows it to shatter into smaller perfect cubes. Often contains silver (argentiferous galena), making it a precious metal ore.
Lore & History
Used since 3000 BC as a source of lead and silver; ancient Egyptians used it as 'kohl' for eye makeup. In metaphysical tradition, it is considered a 'grounding stone' associated with the Root Chakra, believed to help with internal balance and shielding against negativity.