sedimentary
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 with inclusions)
Hardness: 6-7 (Mohs scale); Color: Yellowish-tan/buff with grey specks; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2–2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Yellowish-tan/buff with grey specks
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Yellowish-tan/buff with grey specks; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2–2.8
Formation & geological history
Formed through the accumulation and lithification of sand-sized mineral particles or rock fragments. This specimen appears weathered and stained by iron oxides, typical of terrestrial or shallow marine depositional environments from various geological eras.
Uses & applications
Used primarily as construction material, road base, or aggregate. Highly weathered pieces are sometimes used in landscaping or as decorative stones.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. It is a major reservoir for water (aquifers) and oil/gas due to its high porosity.
Field identification & locations
Identify in the field by its gritty 'sandpaper' feel; it will often crumble slightly when rubbed. Commonly found in desert environments, river beds, and coastal areas. Collectors look for unique banding (Liesegang rings) or fossils within the layers.
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