sedimentary

Likely gray sandstone or fine-grained metamorphic rock

Quartz-rich lithic sandstone; exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

Medium-gray, fine-grained, dull to slightly sparkling surface with possible quartz grains; likely Mohs hardness 6–7, nonmetallic luster, no obvious cleavage, and granular texture. Specific gravity is approximately 2.5–2.7.

Identified August 21, 2026More sedimentary →

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Physical properties

Formation & geological history

Probably formed from compacted and cemented sand-sized quartz and rock fragments, potentially later weakly metamorphosed; age cannot be determined visually. Common in sedimentary layers and weathered outcrops.

Uses & applications

Ordinary sandstone is used for building stone, paving, aggregate, and landscaping; this small specimen has mainly educational or collecting value.

Geological facts

The apparent sparkle may come from quartz grains or mica, which could indicate a metamorphic rock such as metasandstone or fine quartzite rather than ordinary sandstone.

Field identification & locations

Look for visible rounded grains, bedding, and scratch resistance: sandstone commonly shows grains and may crumble, while quartzite is more fused and scratches glass. Common worldwide, especially in former beaches, dunes, river deposits, and mountain belts.