metamorphic
Gray Slate River Stone
Slate
Hardness: 2.5-4 Mohs; Color: Gray to blue-gray; Luster: Dull to slightly waxy; Structure: Fine-grained, foliated with distinct cleavage planes; Specific Gravity: 2.7-2.8.
- Hardness
- 2
- Color
- Gray to blue-gray
- Luster
- Dull to slightly waxy
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Physical properties
Hardness: 2.5-4 Mohs; Color: Gray to blue-gray; Luster: Dull to slightly waxy; Structure: Fine-grained, foliated with distinct cleavage planes; Specific Gravity: 2.7-2.8.
Formation & geological history
Formed through the low-grade metamorphism of shale or mudstone under relatively low pressure and temperature conditions. This specimen has been significantly water-worn and smoothed by fluvial (river) action.
Uses & applications
Commonly used in landscaping, as aquarium decor, or as basic construction material. Professionally quarried slate is used for roofing, flooring, and chalkboards.
Geological facts
Slate can split into very thin, flat sheets. When hit with a hammer, high-quality slate will ring with a metallic sound. Some river stones like this are used for hot-stone massage or stone painting.
Field identification & locations
Identify by its fine-grained texture, gray color, and tendency to break along flat planes (foliation). Found abundantly in riverbeds near mountainous regions with metamorphic history.
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