sedimentary

Sandstone

Arenite (primarily Quartz Arenite)

Hardness: 6-7 on Mohs scale; Color: Brown, tan, or grey; Luster: Dull or earthy; Crystal structure: Clastic (grains); Cleavage: None; Specific gravity: 2.2-2.8

Hardness: 6-7 on Mohs scale
Color: Brown, tan, or grey
Luster: Dull or earthy

Identified May 29, 2026More sedimentary →

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Physical properties

Hardness: 6-7 on Mohs scale; Color: Brown, tan, or grey; Luster: Dull or earthy; Crystal structure: Clastic (grains); Cleavage: None; Specific gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in river beds, deserts, or coastal environments over millions of years.

Uses & applications

Widely used as a construction material (dimension stone), in glass manufacturing (if high silica content), and for pavers or landscaping.

Geological facts

This specific piece is a 'heart rock,' a natural formation where erosion has shaped the stone into a cardioid form, a favorite find for nature enthusiasts and casual collectors.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible grains. Commonly found in sedimentary basins, river banks, and canyons. Collectors value heart-shaped specimens for their aesthetic appeal.