sedimentary

Sandstone with Iron Oxide Concretions

Quartzose Sandstone with Limonite/Hematite

AI-generated identification · may be incorrect

Hardness: 6-7 (for quartz grains); Color: Tan, yellow, or beige with dark brown to black spots; Luster: Dull to earthy; Crystal structure: Microcrystalline to clastic granular; Cleavage: None

Hardness: 6-7 (for quartz grains)
Color: Tan, yellow, or beige with dark brown to black spots
Luster: Dull to earthy

Identified August 2, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (for quartz grains); Color: Tan, yellow, or beige with dark brown to black spots; Luster: Dull to earthy; Crystal structure: Microcrystalline to clastic granular; Cleavage: None

Formation & geological history

Formed from the accumulation, compaction, and cementation of mineral particles or rock fragments, predominantly quartz, in marine, desert, or river environments over millions of years.

Uses & applications

Used primarily in construction, landscaping, as decorative gravel, and as a popular specimen for amateur rock collectors.

Geological facts

The dark spots are often iron oxide or manganese oxide segregations, sometimes referred to as leopard spots or Liesegang banding depending on the patterns they form.

Field identification & locations

Can be identified in the field by its granular texture, visible sand grains, and characteristic iron staining. Common worldwide in sedimentary basins.