metamorphic
Banded Slate Pebble
Metamorphosed Mudstone / Slate
Hardness: 3-4 on Mohs scale. Color: Dark grey to greenish-black with distinct dark foliation banding. Luster: Matte to dull sub-vitreous. Texture: Very fine-grained, smooth water-worn pebble surface. Cleavage: Slaty cleavage along parallel planes.
- Hardness
- 3-4 on Mohs scale
- Luster
- Matte to dull sub-vitreous
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Physical properties
Hardness: 3-4 on Mohs scale. Color: Dark grey to greenish-black with distinct dark foliation banding. Luster: Matte to dull sub-vitreous. Texture: Very fine-grained, smooth water-worn pebble surface. Cleavage: Slaty cleavage along parallel planes.
Formation & geological history
Formed by low-grade regional metamorphism of clay-rich sedimentary rocks such as shale or mudstone under low heat and hydrostatic pressure. The original sedimentary bedding is visible as dark bands within the stone, which was later smoothed and rounded by river or beach water action.
Uses & applications
Commonly used as decorative river rock, landscaping pebbles, aquarium gravel, and occasionally carved or polished into smooth worry stones or decorative craft pieces.
Geological facts
Slate pebbles often retain the subtle original sedimentary layering from millions of years ago, preserved despite undergoing tectonic compression and stream erosion.
Field identification & locations
Identified by its fine-grained texture, dark grey-green tone, distinct parallel banding, and smooth rounded pebble morphology. Frequently found in riverbeds, glacial tills, and coastal beaches near metamorphic terranes.
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