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Amber is fossilized tree resin, an amorphous organic substance rather than a true mineral. It is typically translucent to opaque, with a characteristic warm luster. Its color ranges widely from pale yellow to deep orange, brown, and even red, green, or blue (rarely). It is known for often containing inclusions of ancient insects, plants, and other small organisms, which provide invaluable insights into prehistoric ecosystems. Amber is relatively soft and lightweight.
How to Identify
- Color
- Typically yellow, orange, brown; less commonly red, green, blue, or white. Can be clear, cloudy, or opaque.
- Luster
- Resinous to waxy.
- Texture
- Smooth, often with conchoidal fracture surfaces. Can feel slightly warm to the touch due as it is a poor conductor of heat.
- Crystal Form
- Amorphous; does not form crystals.
- Cleavage
- None, as it is amorphous.
- Geological Environment
- Found in sedimentary deposits, often associated with lignite or coal seams, or washed ashore from marine deposits. Primary deposits are typically ancient forest soils or deltaic sediments; secondary deposits are often found in marine or fluvial sediments where it has been redeposited.
Key Facts
- Hardness: 2-2.5 (Mohs scale)
- Specific Gravity: 1.05-1.10 g/cm³ (will float in saturated saltwater)
- Crystal System: Amorphous (no crystal structure)
- Color: Yellow, orange, brown, red, green, blue, white, black
- Luster: Resinous, waxy, dull
- Transparency: Transparent to opaque
- Fracture: Conchoidal
- Cleavage: None
- Composition: Complex mixture of organic compounds, primarily polymerized isoprenoids (e.g., succinic acid is characteristic of Baltic amber)
Quick Check
- Color: Yellow to brown, often translucent
- Luster: Resinous to waxy
- Streak: White (though rarely tested due to its organic nature and softness)
Physical Characteristics
- Crystal Habit: Amorphous masses, nodules, stalactitic forms, or irregular lumps.
- Cleavage Type: None
- Fracture Type: Conchoidal, brittle
- Tenacity: Brittle
- Luster Type: Resinous to waxy
Formation
Amber forms from the fossilization of tree resin. Resin, exuded by certain trees (primarily conifers, but also some angiosperms), hardens over millions of years through a process called polymerization, where volatile components evaporate and organic compounds link together to form a more stable, insoluble polymer. This process occurs under specific geological conditions, typically in sedimentary environments where the resin is buried and protected from oxidation and microbial decay. Over time, pressure and temperature contribute to its maturation.
Usage
Primarily used as a gemstone for jewelry and ornamental objects. Historically, it has been used in folk medicine, as an incense, and for scientific study due to its inclusions of ancient flora and fauna. Amber is also used in some varnishes and as a component in certain traditional medicines.
Age Distribution
Predominantly Cenozoic (Tertiary period), ranging from approximately 10 to 320 million years old, with the most commercially significant deposits (Baltic Amber) being Eocene (35-50 million years old).
Where to Find
Baltic Sea Region (e.g., Kaliningrad Oblast, Russia; Poland; Lithuania; Latvia; Estonia; Germany; Denmark)
The most significant source of amber globally, known as Baltic Amber or Succinite. Found in Eocene 'Blue Earth' deposits and washed ashore along the Baltic coast.
Dominican Republic
Known for its clear amber, often containing numerous insect inclusions, dating from the Miocene epoch (15-20 million years old). Famous for rare blue and green varieties.
Myanmar (Burma)
Burmite, primarily from the Hukawng Valley, is Cretaceous in age (99 million years old) and is scientifically important for its diverse fossil inclusions, including dinosaurs and early birds.
Mexico (Chiapas)
Mexican amber, primarily from the Simojovel area, is Miocene in age (20-30 million years old) and often contains insect inclusions.
Lebanon
Lebanese amber is among the oldest known, dating back to the Early Cretaceous (125-135 million years old), providing insights into early insect evolution.
Finding Tips
Coastal Foraging
Along the Baltic Sea coast, amber is often found washed ashore after storms, particularly in autumn and winter. Look among seaweed and debris lines.
UV Light Test
Many types of amber, especially Baltic amber, fluoresce under shortwave or longwave UV light, typically emitting a pale blue or green glow. This can help distinguish it from imitations.
Saltwater Test
Genuine amber has a specific gravity of approximately 1.05-1.10 g/cm³ and will float in a saturated saltwater solution (about 10 teaspoons of salt per cup of water), whereas most plastic imitations and glass will sink.
Hot Needle Test (Caution Recommended)
When a heated needle is pressed into an inconspicuous spot, genuine amber will emit a faint, pleasant pine-like odor and the needle will penetrate slightly. Plastics will smell like burning plastic and glass will not be affected. Use extreme caution to avoid damage or injury.
Hardness Test
Amber is relatively soft (2-2.5 on Mohs scale) and can be scratched with a knife or even a fingernail (though this is not recommended for valuable pieces). Plastics and glass are generally harder.
Similar Rocks
Copal
Copal is a younger, less polymerized form of tree resin, typically less than a few million years old. It is often mistaken for amber but is softer and has a lower melting point.
Also known as: Young Amber
Plastic (e.g., Bakelite, Celluloid)
Various plastics are used to imitate amber. They can be distinguished by density, hardness, smell when heated, and often by the presence of perfectly formed, modern inclusions or mold lines.
Also known as: Faux Amber
Glass
Colored glass can mimic amber. It is typically harder, denser, and colder to the touch than amber, and will not float in saltwater.
Also known as: Faux Amber
Scientific Classification
- Mineral Class
- Organic Gemstone (not a true mineral)
- Group
- Fossilized Resins
- Crystal System
- Amorphous
- Chemical Formula
- Variable, generally C10H16O + (H2S)x for succinite, but highly complex and polymeric.
- Composition
- Polymerized hydrocarbons, primarily isoprenoids, with varying amounts of succinic acid (in Baltic amber), volatile oils, and other organic compounds. Elemental composition is approximately 79% Carbon, 10.5% Hydrogen, 10.5% Oxygen.
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