metamorphic

Veined quartz-bearing metamorphic rock

Likely quartzite or quartz-veined hornfels; exact identification requires a fresh surface and tests

AI-generated identification · may be incorrect

Brown, weathered, fine- to medium-grained matrix cut by prominent creamy-white quartz veins; dull to slightly earthy luster, massive texture, no obvious cleavage. Estimated hardness 5–7 overall, with quartz veins near Mohs 7; specific gravity roughly 2.6–2.8.

Identified September 14, 2026More metamorphic →

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At a glance

Common name: Veined quartz-bearing metamorphic rock
Scientific name: Likely quartzite or quartz-veined hornfels; exact identification requires a fresh surface and tests
Category: metamorphic
Identified: September 14, 2026
Method: Standard

AI Estimated Value

About $5–$30 as a common hand specimen; potentially $30–$100 if provenance, aesthetics, or unusually fine veining is documented.

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

Probably formed when silica-rich fluids filled fractures in a preexisting rock, followed by metamorphic recrystallization; age cannot be determined from the image. Such rocks occur in contact- or regional-metamorphic terrains and hydrothermal vein systems.

Uses & applications

Primarily a geological specimen or decorative stone; sound quartzite may be used as aggregate, building stone, or landscaping material, but this weathered piece has little industrial value.

Geological facts

The pale bands are most likely quartz veins, though calcite is possible if they fizz with dilute hydrochloric acid. Brown coloration commonly reflects iron-oxide weathering.

Field identification & locations

Look for glassy quartz, hard vein material that scratches steel or glass, and absence of layering; a streak, acid, hardness, and thin-section test would distinguish quartzite from calcite-veined hornfels. Common in mountain belts and contact zones.