sedimentary
Green Sandstone Pebble (River/Beach Pebble)
Glauconitic Sandstone
Hardness: 6-7 on Mohs scale; Color: Greenish-teal with slight iron staining; Luster: Dull/earthy to sub-vitreous; Structure: Fine-grained clastic sedimentary; Cleavage: None
- Hardness
- 6-7 on Mohs scale
- Color
- Greenish-teal with slight iron staining
- Luster
- Dull/earthy to sub-vitreous
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Greenish-teal with slight iron staining; Luster: Dull/earthy to sub-vitreous; Structure: Fine-grained clastic sedimentary; Cleavage: None
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, often rich in glauconite or chlorite, giving it a characteristic greenish color. Subsequently rounded and smoothed by water action in river, stream, or ocean environments.
Uses & applications
Commonly used for landscaping, decorative gravel, aquariums, pebble art, and general rock collecting.
Geological facts
Glauconite-rich sandstones are often referred to as 'greensand' and were historically used as a natural fertilizer due to their high potassium content.
Field identification & locations
Identified by its fine sand-grained texture, smooth water-worn oblong shape, and greenish-gray hue. Frequently found along riverbeds, coastlines, and alluvial deposits worldwide.
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