Rock Identifier
Polished amber (likely copal or amber imitation) (Amber: fossilized tree resin, chiefly polymerized succinic resin; copal is younger, incompletely polymerized resin) — gemstone
gemstone

Polished amber (likely copal or amber imitation)

Amber: fossilized tree resin, chiefly polymerized succinic resin; copal is younger, incompletely polymerized resin

AI-generated identification · may be incorrect

Honey-brown, translucent, resinous luster with rounded polished surfaces and dark inclusions; Mohs hardness about 2–2.5 (amber) or 1.5–2 (copal), amorphous rather than crystalline, with no cleavage. The irregular paired form and surface appearance may also indicate a carved or assembled specimen.

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Physical properties

Honey-brown, translucent, resinous luster with rounded polished surfaces and dark inclusions; Mohs hardness about 2–2.5 (amber) or 1.5–2 (copal), amorphous rather than crystalline, with no cleavage. The irregular paired form and surface appearance may also indicate a carved or assembled specimen.

Formation & geological history

Amber formed when ancient conifer or flowering-plant resin was buried, chemically altered, and polymerized over millions of years; major deposits are Eocene Baltic amber (~34–56 million years old) and Cretaceous amber. Copal is much younger, commonly thousands to a few million years old.

Uses & applications

Used for beads, cabochons, carvings, ornaments, and scientific inclusions; amber is collectible, while copal and imitations are substantially less valuable.

Geological facts

Genuine amber is lightweight, warm to the touch, electrostatic when rubbed, and commonly contains insects or plant fragments. Identification requires caution because copal, plastic, and reconstructed amber can look similar.

Field identification & locations

Common sources include the Baltic region, Dominican Republic, Mexico, Myanmar, and Indonesia; examine inclusions, UV fluorescence, density, and a professional FTIR test. Avoid destructive tests on polished pieces.