sedimentary

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)

AI-generated identification · may be incorrect

Hardness: 6-7 (quartz matrix), Color: Yellow-brown to tan (due to iron oxide), Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None

Identified April 1, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (quartz matrix), Color: Yellow-brown to tan (due to iron oxide), Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The yellow tint is caused by limonite staining during lithification or secondary weathering in fluvial or marine environments.

Uses & applications

Common sandstone is used in construction as building stone or aggregate. This specific specimen is of interest primarily as a decorative garden stone or a geological curiosity for collectors.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The 'pocket' or indentation in this specimen may have formed from the weathering out of a softer mineral nodule or a biological trace like a fossil fragment.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and the yellowish 'rust' color of iron oxide. Commonly found in riverbeds, cliffs, and desert environments worldwide.