gemstone

Amber with dark mineral/organic inclusions

Fossilized plant resin (amber; chiefly polymerized diterpenoid resin)

AI-generated identification · may be incorrect

Translucent honey-brown to orange resin with vitreous-to-resinous luster and irregular conchoidal fracture; Mohs hardness about 2–2.5, very low density (~1.05–1.10), amorphous rather than crystalline. The black material may be inclusions, weathered crust, or attached sediment/iron-manganese minerals.

Identified August 10, 2026More gemstone →

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Physical properties

Formation & geological history

Amber forms when ancient tree resin is buried, compacted, and chemically polymerized over millions of years, commonly in Paleogene–Cretaceous sedimentary deposits. This specimen appears water-worn and may be partly coated by stream sediment.

Uses & applications

Used for cabochons, beads, carvings, ornaments, and scientific inclusions; it is generally unsuitable for construction. Value depends strongly on clarity, color, size, and authentic inclusions.

Geological facts

Amber often floats in salt water and becomes electrostatic when rubbed; it softens or produces a resinous odor when gently warmed, though destructive tests should be avoided.

Field identification & locations

Common sources include the Baltic region, Dominican Republic, Mexico, Myanmar, and Indonesia. A field clue is unusually low density, warm resinous appearance, and conchoidal fracture; professional testing is needed because copal, plastic, and slag can resemble it.