sedimentary
Sandstone (Stream Pebble)
Arenite (primarily SiO2)
Hardness: 6-7 (Mohs scale); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal Structure: Clastic (grainy); Cleavage: None; Specific Gravity: 2.2-2.8.
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, beige, or light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, beige, or light brown; Luster: Dull/Earthy; Crystal Structure: Clastic (grainy); Cleavage: None; Specific Gravity: 2.2-2.8.
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (sand-sized). This specific specimen has been rounded and smoothed by fluvial (river) or glacial transport over thousands of years.
Uses & applications
Commonly used as construction aggregate, decorative landscaping stone, or as a source of silica for glass manufacturing.
Geological facts
Sandstone can be composed of almost any mineral, but quartz is the most common because it is the most resistant to chemical weathering. This smooth, elliptical shape is known as a 'clast' in geology.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and rounded edges indicating water transport. Commonly found in riverbeds, beaches, and ancient sedimentary basins.
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