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Native lead is a very rare mineral consisting of the element lead (Pb). It is characterized by its soft, malleable nature, high density, and metallic luster. It quickly tarnishes upon exposure to air, forming a dull gray or black oxide layer. Its occurrence is typically in small, irregular masses, flakes, or dendritic forms within other mineral assemblages.
How to Identify
- Color
- Freshly broken surfaces are silvery-white to bluish-gray, quickly tarnishing to dull gray or black upon exposure to air.
- Luster
- Metallic on fresh surfaces, dull to earthy on tarnished surfaces.
- Texture
- Very soft and malleable, can be easily scratched with a fingernail and leaves a streak on paper.
- Crystal Form
- Typically occurs as irregular masses, flakes, scales, or dendritic aggregates. Rarely forms cubic or octahedral crystals.
- Cleavage
- No true cleavage, but exhibits an imperfect parting.
- Geological Environment
- Hydrothermal veins, altered lead-bearing mineral deposits (e.g., galena), and occasionally in metamorphic rocks or meteorites. Requires highly reducing conditions for formation.
Key Facts
- Hardness: 1.5 (Mohs scale)
- Specific Gravity: 11.34 g/cm³
- Crystal System: Cubic (isometric)
- Color: Silvery-white to bluish-gray on fresh surfaces, rapidly tarnishes to dull gray or black.
- Luster: Metallic on fresh surfaces, dull to earthy on tarnished surfaces.
- Transparency: Opaque
- Fracture: Hackly
- Cleavage: None, but exhibits imperfect parting.
- Composition: Pure Lead (Pb)
Quick Check
- Color: Silvery-white to bluish-gray (fresh), dull gray to black (tarnished)
- Luster: Metallic (fresh), dull/earthy (tarnished)
- Streak: Gray
Physical Characteristics
- Crystal Habit: Typically massive, granular, flaky, dendritic, or as small irregular grains. Rarely forms distinct cubic or octahedral crystals.
- Cleavage Type: Absent, but may show imperfect parting along cubic planes.
- Fracture Type: Hackly (jagged, sharp, and irregular fractures, typical of malleable metals).
- Tenacity: Sectile (can be cut with a knife) and malleable (can be hammered into thin sheets without breaking).
- Luster Type: Metallic
Formation
Native lead is a rare mineral, typically forming under highly reducing conditions. It can occur in hydrothermal veins, often associated with other lead minerals like galena (PbS) and cerussite (PbCO3), or as a product of the alteration of these minerals in oxygen-poor environments. It has also been found in some metamorphic rocks and as a component of meteorites. Its presence indicates a very low oxygen fugacity during its formation.
Usage
Native lead itself has no significant industrial use due to its rarity. However, lead (the element) is extensively used in batteries, ammunition, radiation shielding, plumbing, and as an alloying agent. Historically, lead was used in pigments, solders, and various construction materials.
Age Distribution
Can form in various geological ages, often associated with hydrothermal activity or alteration of lead-bearing minerals.
Where to Find
Långban, Värmland, Sweden
Known for its diverse mineralogy, including rare occurrences of native lead.
Franklin, New Jersey, USA
Another classic locality for rare minerals, where native lead has been reported.
Various meteorites
Native lead has been identified as a trace component in some iron and stony meteorites.
Certain hydrothermal vein deposits
Sporadic occurrences in lead-zinc deposits where highly reducing conditions prevailed, often as an alteration product.
Finding Tips
Look for associated minerals
Native lead is often found in association with other lead minerals like galena, cerussite, and anglesite, or with other native metals in highly reduced environments.
Check for high density
Lead is exceptionally dense (specific gravity ~11.3), which is a key characteristic for identification, even in small samples.
Test for softness and malleability
Its extreme softness (Mohs 1.5) and malleability are distinctive. It can be easily cut with a knife and will deform rather than break.
Observe tarnish
The rapid tarnishing from silvery-blue to dull gray/black is a good indicator, though other metals also tarnish.
Safety Precautions
Lead is a toxic heavy metal. Avoid direct skin contact, especially if handling frequently. Do not ingest or inhale dust. Always wash hands thoroughly after handling. Store samples securely to prevent access by children or pets. For cutting or grinding, use appropriate personal protective equipment (PPE) including gloves and respiratory protection in a well-ventilated area to prevent lead dust inhalation.
Similar Rocks
Galena
Lead Sulfide (PbS)
Also known as: Lead glance
Cerussite
Lead Carbonate (PbCO3)
Also known as: White lead ore
Stibnite
Antimony Sulfide (Sb2S3)
Also known as: Antimony glance
Native Bismuth
Bismuth (Bi)
Also known as: Bismuth
Scientific Classification
- Mineral Class
- Native Elements
- Group
- Native Metals
- Crystal System
- Isometric (Cubic)
- Chemical Formula
- Pb
- Composition
- Pure lead, sometimes with trace impurities of other metals.
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