sedimentary
Sandstone with Quartz Veining
Clastic sedimentary rock (SiO2 dominated)
Hardness: 6-7 (Mohs scale); Color: Tan, brown, reddish-pink due to iron oxides; Luster: Dull/Earthy (matrix), Vitreous (quartz veins); Structure: Clastic/Granular; Cleavage: None.
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, brown, reddish-pink due to iron oxides
- Luster
- Dull/Earthy (matrix), Vitreous (quartz veins)
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, brown, reddish-pink due to iron oxides; Luster: Dull/Earthy (matrix), Vitreous (quartz veins); Structure: Clastic/Granular; Cleavage: None.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral or rock particles. The visible white crystalline bands represent secondary quartz veins formed by hydrothermal fluids filling fractures long after the initial sedimentation.
Uses & applications
Common sandstone is used in construction and landscaping. Specimens with interesting veining or colors are used for lapidary work or as garden accents and decorative desk pieces.
Geological facts
Sandstone can withstand weathering for centuries and is the most common rock used in the construction of ancient temples and cathedrals worldwide.
Field identification & locations
Identify by its gritty, abrasive texture (like sandpaper) and visible quartz grains. Often found in desert environments, riverbeds, and coastal cliffs. Collectors look for high-contrast 'Liesegang bands' or mineralization.
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