sedimentary
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 Mohs; Color: Tan to light brown; Luster: Dull/Earthy; Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8. Shows a smooth, water-worn texture.
- Hardness
- 6-7 Mohs
- Color
- Tan to light brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan to light brown; Luster: Dull/Earthy; Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8. Shows a smooth, water-worn texture.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, typically quartz. This specific rounded shape indicates water erosion in a river, stream, or beach environment over many years.
Uses & applications
Used in construction, landscaping, road base, and as a common decorative garden stone. Pure quartz sandstones are used in glass manufacturing.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The smooth 'river rock' texture seen here is a result of abrasion against other rocks in moving water.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper if broken) and visible layering (bedding). Found worldwide in basins and coastal regions. Collectors often value heart-shaped or exceptionally smooth specimens like this one.
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