sedimentary

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

AI-generated identification · may be incorrect

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

Identified March 26, 2026More sedimentary →

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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.