metamorphic
Polished banded limestone or marble pebble
Calcite-rich carbonate rock; likely banded marble (recrystallized limestone)
AI-generated identification · may be incorrectGray, cream, and dark brown/black wavy bands with a dull-to-satin polish; primarily calcite, Mohs hardness 3, white streak, rhombohedral cleavage, and specific gravity about 2.7. The rounded shape and surface sheen indicate tumbling or natural abrasion.
Identified More metamorphic →
Explore Polished banded limestone or marble pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Gray, cream, and dark brown/black wavy bands with a dull-to-satin polish; primarily calcite, Mohs hardness 3, white streak, rhombohedral cleavage, and specific gravity about 2.7. The rounded shape and surface sheen indicate tumbling or natural abrasion.
Formation & geological history
Likely formed from marine carbonate sediments later recrystallized and folded during regional metamorphism; exact geological age cannot be determined from the photograph. It may also be dense banded limestone rather than marble.
Uses & applications
Used as a decorative stone, cabochon, paperweight, or collecting specimen; carbonate stone is also used for aggregate, cement, and dimension stone. It is generally unsuitable for durable jewelry because calcite scratches easily.
Geological facts
The pale curving markings may be folded compositional bands or fossil/relict structures. A drop of dilute hydrochloric acid or vinegar should produce visible fizz if calcite is exposed.
Field identification & locations
Commonly found in metamorphic belts and carbonate outcrops worldwide, including India, Mexico, Turkey, Italy, and the United States. Identify with a hardness test and acid reaction; avoid confusing it with banded jasper, which is harder and does not effervesce.
More like this
