metamorphic
Weathered gray slate or phyllite pebble
Fine-grained, foliated metamorphic rock; exact identification requires closer examination
AI-generated identification · may be incorrectDull gray-green surface with pale mineral veins and a platy, elongated shape. Slate and phyllite are commonly composed of quartz, mica, and chlorite; hardness is typically about 2.5–4 Mohs, with cleavage or foliation that can split into thin sheets.
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Physical properties
Dull gray-green surface with pale mineral veins and a platy, elongated shape. Slate and phyllite are commonly composed of quartz, mica, and chlorite; hardness is typically about 2.5–4 Mohs, with cleavage or foliation that can split into thin sheets.
Formation & geological history
Likely formed when clay-rich sedimentary rock was compressed and metamorphosed at low grade; its age and specific geological setting cannot be determined from the image.
Uses & applications
Comparable material is used for roofing, paving, and landscaping; this small pebble has mainly decorative or collecting interest.
Geological facts
The elongated form and smooth surface may result from transport and abrasion, while the light markings may be quartz or calcite veins.
Field identification & locations
Look for fine foliation and splitting planes; phyllite often has a subtle satiny sheen, whereas slate is duller. Similar rocks occur in metamorphic belts worldwide.
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