sedimentary
Sandstone (Quartz Sandstone)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs scale); Color: Brown, tan, or yellow-brown; Luster: Dull/Earthy; Crystal Structure: Clastic grains; Cleavage: None; Specific Gravity: 2.2 - 2.8. Features a gritty, sandpaper-like texture.
- Hardness
- 6-7 (Mohs scale)
- Color
- Brown, tan, or yellow-brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Brown, tan, or yellow-brown; Luster: Dull/Earthy; Crystal Structure: Clastic grains; Cleavage: None; Specific Gravity: 2.2 - 2.8. Features a gritty, sandpaper-like texture.
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years. This specimen appears to be a rounded 'beach cobble' shaped by wave action and abrasion in a high-energy coastal environment.
Uses & applications
Used extensively as a construction material (dimension stone), in glass manufacturing if pure enough, and for artistic sculptures. This specific rounded form is often used in landscaping and garden design.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. Because it is porous, it often acts as an important aquifer for groundwater or a reservoir for petroleum and natural gas.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. This specimen's smooth, rounded shape is a primary indicator of water transport or coastal erosion. Common in beaches, desert dunes, and riverbeds.
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