metamorphic
Banded limestone or marble
Calcite-dominated carbonate rock; likely banded marble (CaCO₃)
AI-generated identification · may be incorrectGray to cream, fine-grained, with irregular light bands and a dull to weakly sugary luster; calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.7. The rounded edges suggest tumbling or natural abrasion.
Identified More metamorphic →
Explore Banded limestone or marble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Gray to cream, fine-grained, with irregular light bands and a dull to weakly sugary luster; calcite has Mohs hardness 3, rhombohedral cleavage, and specific gravity about 2.7. The rounded edges suggest tumbling or natural abrasion.
Formation & geological history
If marble, it formed when limestone recrystallized during regional or contact metamorphism, typically from Paleozoic or younger carbonate beds; if unmetamorphosed, it is banded limestone. Commonly associated with ancient shallow-marine sediments and metamorphic belts.
Uses & applications
Used as decorative stone, aggregate, tile, and sculpture material; attractive polished pieces may be sold as ornamental stone, though this specimen appears relatively common.
Geological facts
The pale bands may represent calcite-rich layers, veins, or altered sedimentary bedding. A drop of dilute hydrochloric acid or vinegar should fizz strongly on a fresh surface if calcite is exposed.
Field identification & locations
Test with a steel nail (usually no scratch), inspect for calcite cleavage, and apply acid to a fresh area; marble commonly shows interlocking sparkling grains, whereas limestone is more compact or fossiliferous. Similar material occurs worldwide in carbonate and metamorphic terrains.
More like this
