metamorphic
Polished banded limestone or marble pebble
Calcite-rich carbonate rock (CaCO₃), possibly banded marble
AI-generated identification · may be incorrectCream-white with brown-gray parallel bands and a matte-to-waxy polished surface; calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.7. The rounded form and grooves indicate intentional tumbling or natural abrasion.
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Physical properties
Cream-white with brown-gray parallel bands and a matte-to-waxy polished surface; calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.7. The rounded form and grooves indicate intentional tumbling or natural abrasion.
Formation & geological history
Likely formed from layered carbonate sediment that was lithified and locally recrystallized during metamorphism; its exact geological age cannot be determined from the image. Similar material occurs in carbonate terrains worldwide.
Uses & applications
Used as a decorative stone, worry stone, craft pebble, or lapidary material; generally low commercial value unless the banding is unusually attractive.
Geological facts
Calcite reacts vigorously with dilute hydrochloric acid, producing fizz; marble may react more slowly if recrystallized. Brown bands may reflect iron oxides or clay-rich layers.
Field identification & locations
Test with a steel knife or copper coin only if damage is acceptable, and apply dilute acid to an inconspicuous spot; visible fizz supports calcite. Common sources include Italy, Turkey, India, Mexico, and the United States.
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