sedimentary

Sandstone with attached barnacles

Quartz sandstone (Silicon Dioxide - SiO2 matrix)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Reddish-brown to tan with iron-oxide staining; Luster: Earthy, dull, or microcrystalline; Texture: Medium-grained, rough, abrasive with weathered marine encrustations (acorn barnacles); Cleavage: None

Hardness: 6-7 on Mohs scale
Color: Reddish-brown to tan with iron-oxide staining
Luster: Earthy, dull, or microcrystalline

Identified July 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation, compaction, and cementation of sand-sized grains, typically quartz and feldspar, in ancient river, beach, or desert environments. The specimen has been ocean-worn and washed ashore, as evidenced by attached marine barnacle shells.

Uses & applications

Used primarily in landscaping, construction, and coastal erosion control. As a beach specimen, it serves as an educational sample for coastal geology and marine interaction.

Geological facts

The presence of intact fossilized or recent barnacle shells attached to the rock indicates this specimen spent significant time submerged in marine intertidal zone waters before being collected on a shore.

Field identification & locations

Identified by its sandy, abrasive surface texture, reddish-brown iron staining, and attached white calcareous barnacle shells. Commonly found along rocky coastlines, marine gravel beds, and intertidal beaches.