Rock Identifier
Polished amber (likely copal or amber) (Amber: fossilized plant resin, chiefly polymerized diterpenes; copal is younger, partially polymerized resin) — gemstone
gemstone

Polished amber (likely copal or amber)

Amber: fossilized plant resin, chiefly polymerized diterpenes; copal is younger, partially polymerized resin

AI-generated identification · may be incorrect

Translucent honey-orange to reddish-brown, resinous luster, amorphous/noncrystalline, Mohs hardness about 2–2.5 for amber (copal about 1.5–2.0), very low density (~1.05–1.10). The rough, bubbly surface and vivid translucency are consistent with resin rather than crystalline mineral.

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Physical properties

Translucent honey-orange to reddish-brown, resinous luster, amorphous/noncrystalline, Mohs hardness about 2–2.5 for amber (copal about 1.5–2.0), very low density (~1.05–1.10). The rough, bubbly surface and vivid translucency are consistent with resin rather than crystalline mineral.

Formation & geological history

Plant resin accumulated in sediment and polymerized over roughly 2–less than 100 million years; true amber is generally tens of millions of years old, whereas copal is much younger. Common deposits occur in sedimentary basins around the Baltic region, the Dominican Republic, Mexico, Myanmar, and Colombia.

Uses & applications

Used for carvings, beads, cabochons, ornaments, and jewelry; historically used as incense and varnish. Amber with insects, unusual color, or strong natural clarity can be especially desirable.

Geological facts

Amber floats in concentrated salt water and becomes electrostatically charged when rubbed. It softens with heat and may smell resinous; copal usually melts or becomes tacky more readily than mature amber.

Field identification & locations

Identify by low density, warm resin odor when gently warmed, softness, and absence of crystal cleavage; avoid destructive tests on a finished piece. The image may show copal rather than fully fossilized amber.