metamorphic

Black-and-white banded pebble (likely gneiss or migmatite)

Undetermined banded metamorphic rock; mineral composition cannot be confirmed from the image

AI-generated identification · may be incorrect

Rounded, polished dark and cream-colored bands or veins; likely quartz/feldspar with dark mica or amphibole. Hardness and crystal structure are not reliably identifiable visually.

Identified October 4, 2026More metamorphic →

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Physical properties

Rounded, polished dark and cream-colored bands or veins; likely quartz/feldspar with dark mica or amphibole. Hardness and crystal structure are not reliably identifiable visually.

Formation & geological history

If gneiss or migmatite, formed when pre-existing rock was recrystallized and segregated into light and dark bands under high heat and pressure; age depends on its source region.

Uses & applications

Primarily a decorative or collectible pebble; banded stone may also be used for landscaping or ornamental objects.

Geological facts

The pale band resembles a quartz- or feldspar-rich vein, but appearance alone cannot distinguish a natural vein from other light-colored mineral bands.

Field identification & locations

Check for visible interlocking grains and continuous mineral banding; a close-up or hardness test would improve identification. Banded metamorphic rocks occur in many ancient continental terrains worldwide.