metamorphic

Quartz-rich sandstone or quartzite fragment

Probable quartzite; chiefly microcrystalline quartz (SiO₂), possibly with feldspar and iron-oxide staining

AI-generated identification · may be incorrect

Gray-tan, fine-grained, dull to slightly sparkly surface with granular texture; quartz hardness ~7, no obvious cleavage, conchoidal-to-uneven fracture, and specific gravity about 2.6. The strongly cemented appearance favors quartzite, though the image cannot exclude sandstone.

Identified September 17, 2026More metamorphic →

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At a glance

Common name: Quartz-rich sandstone or quartzite fragment
Scientific name: Probable quartzite; chiefly microcrystalline quartz (SiO₂), possibly with feldspar and iron-oxide staining
Category: metamorphic
Identified: September 17, 2026
Method: Standard

AI Estimated Value

Typically $1-$10 as a common field specimen; less than $25 unless unusually attractive, locality-specific, or part of a documented collection.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

Likely derived from silica-rich sand compressed and cemented, then possibly metamorphosed during regional mountain-building; age depends on its source formation. The dark gray cap may be weathering, staining, or a thin different lithologic layer.

Uses & applications

Quartzite is used as durable aggregate, road stone, building stone, and occasionally decorative stone; attractive pieces may be collected but this specimen has little commercial value.

Geological facts

Quartzite commonly preserves faint sand textures while breaking across individual grains rather than crumbling around them. Iron oxides can produce tan, rust, and brown coloration.

Field identification & locations

Common in metamorphic terrains and stream gravels worldwide, especially near resistant ridges. Test a fresh edge with a steel knife and inspect with a hand lens: quartzite scratches glass and shows tightly interlocked grains; sandstone usually feels more friable and grains may detach.