metamorphic

Banded calcite (likely polished limestone/marble fragment)

Calcite, CaCO₃; probable banded calcitic marble

AI-generated identification · may be incorrect

Cream, tan, gray, and dark bands with a dull-to-waxy luster and granular texture; calcite is Mohs hardness 3, has perfect rhombohedral cleavage, and specific gravity about 2.71. The specimen appears saw-cut or tumbled, with visible fibrous/granular banding.

Identified September 16, 2026More metamorphic →

Explore Banded calcite (likely polished limestone/marble fragment) 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

Likely formed when limestone recrystallized during low- to medium-grade metamorphism, producing marble and preserving compositional banding. Such rocks commonly formed in ancient Paleozoic–Precambrian mountain belts, though age cannot be determined from the image.

Uses & applications

Used as decorative stone, tile, aggregate, and architectural marble; attractive pieces are collected or made into cabochons and polished ornaments.

Geological facts

Calcite effervesces strongly with dilute hydrochloric acid or household vinegar if freshly scratched. Its banding may reflect alternating impurities such as quartz, clay minerals, iron oxides, or graphite.

Field identification & locations

Common in metamorphic terrains worldwide, including Italy, Greece, Vermont, Colorado, and India. Identify by its softness, carbonate reaction, and lack of obvious glassy quartz; a photo alone cannot confirm the exact rock.