metamorphic

Rounded green-gray pebble, likely quartz-rich metamorphic rock

Possibly quartzite or fine-grained schist; identification is uncertain from the photograph

AI-generated identification · may be incorrect

Dull to slightly sparkly gray-green surface with pale mineral grains and subtle foliation or banding; likely quartz and feldspar with mica or chlorite. Hardness is probably around 6–7 if quartz-rich; crystal structure and specific gravity cannot be determined from the image.

Identified October 8, 2026More metamorphic →

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Physical properties

Formation & geological history

If quartzite, it formed when sandstone was recrystallized under heat and pressure; if schist, its minerals recrystallized and aligned during metamorphism. The pebble’s age and original source cannot be determined visually.

Uses & applications

This appears to be a common natural pebble, suitable for collecting or display; similar rocks are used as aggregate or decorative stone.

Geological facts

The rounded shape and smoothed surface are consistent with abrasion during transport by water or ice.

Field identification & locations

Look for interlocking quartz grains and a hard, scratch-resistant surface to distinguish quartzite; visible aligned flakes suggest schist. A more precise identification requires closer inspection or simple tests.