mineral

Tumbled amber calcite (likely honey/orange calcite)

Calcite, calcium carbonate (CaCO₃)

AI-generated identification · may be incorrect

Typically Mohs hardness 3, honey-yellow to orange, translucent, with vitreous to pearly luster and prominent rhombohedral cleavage; the rounded shape indicates tumbling. It may effervesce in dilute hydrochloric acid or vinegar (slowly).

Identified September 15, 2026More mineral →

Explore Tumbled amber calcite (likely honey/orange calcite) in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Calcite forms from hydrothermal fluids, limestone alteration, or precipitation in caves and sedimentary environments; individual specimens may range from recent deposits to ancient Paleozoic–Mesozoic rocks. The orange color commonly comes from iron or other trace impurities.

Uses & applications

Used for teaching, mineral collecting, ornamental carvings, and occasionally decorative stone; it is too soft for most jewelry. Common tumbled pieces generally have modest value.

Geological facts

Calcite is highly birefringent: transparent pieces can produce doubled images when viewed through them. Its three-direction cleavage distinguishes it from harder quartz, which lacks cleavage.

Field identification & locations

Commonly found in Mexico, the United States, Iceland, China, and many limestone regions. Confirm with hardness testing against a copper coin or steel knife, cleavage, and acid reaction; avoid scratching polished surfaces.