metamorphic

Likely weathered quartz-rich rock with iron staining

Indeterminate from the photograph; possibly quartzite or quartz-rich vein material with iron-oxide coatings

AI-generated identification · may be incorrect

Gray-white, opaque, massive and weathered, with rusty brown staining and irregular fractures. Quartz-rich material is typically Mohs 7, vitreous to dull, and lacks cleavage; the image does not show enough detail to confirm grain structure or hardness.

Identified October 14, 2026More metamorphic →

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At a glance

Common name: Likely weathered quartz-rich rock with iron staining
Scientific name: Indeterminate from the photograph; possibly quartzite or quartz-rich vein material with iron-oxide coatings
Category: metamorphic
Identified: October 14, 2026
Method: Standard

AI Estimated Value

About $0–$10 as an ordinary loose specimen; more only if testing or a distinctive feature establishes a collectible identity.

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

Could have formed through metamorphism of quartz sandstone or as silica deposited in fractures, later stained by iron oxides during weathering. A precise age cannot be determined from appearance alone.

Uses & applications

Quartzite is used as crushed stone, aggregate, and decorative building stone; attractive pieces may be collected, but this specimen shows no obvious gem-grade features.

Geological facts

Iron oxides commonly produce orange-brown streaks on otherwise pale quartz-rich rocks.

Field identification & locations

The coarse regional location is in eastern Taiwan, where varied metamorphic rocks occur, making quartz-rich material plausible. A fresh broken surface, grain texture, and hardness test would help distinguish quartzite from a quartz vein or other pale rock.