sedimentary
Sandstone (Yellow/Tan)
Clastic sedimentary rock (primarily SiO2 with iron oxide staining)
Hardness: 6-7 (Mohs scale for individual grains); Color: Tan/Yellow/Buff; Luster: Dull/Earthy; Crystal Structure: Clastic (composed of rounded sand grains); Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale for individual grains)
- Color
- Tan/Yellow/Buff
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale for individual grains); Color: Tan/Yellow/Buff; Luster: Dull/Earthy; Crystal Structure: Clastic (composed of rounded sand grains); Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral particles or rock fragments. This specimen appears to be water-worn, suggesting a secondary origin in a riverbed or coastal environment. Geological age ranges from Precambrian to Holocene.
Uses & applications
Used extensively as a construction building material, for paving stones, grindstones, and in glass manufacturing if the quartz purity is high.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The famous 'Petra' ruins in Jordan are carved directly into sandstone cliffs. The yellow/tan color usually comes from the presence of Limonite or Goethite.
Field identification & locations
Identify in the field by its gritty 'sandpaper' feel and visible grains. It is commonly found in desert environments, river basins, and ocean shores. Collectors look for unique banding or 'picture sandstone' patterns.
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