metamorphic

Weathered quartz-rich rock, likely silicified limestone or quartzite

Microcrystalline quartz (SiO₂), possibly with calcite (CaCO₃) and iron-oxide staining

AI-generated identification · may be incorrect

Hardness about 6–7 if quartz-dominant, but softer reactive patches may be calcite; pale gray, cream, and brown, with vitreous to dull luster, massive texture, and irregular cavities rather than obvious cleavage.

Identified August 8, 2026More metamorphic →

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At a glance

Common name: Weathered quartz-rich rock, likely silicified limestone or quartzite
Scientific name: Microcrystalline quartz (SiO₂), possibly with calcite (CaCO₃) and iron-oxide staining
Category: metamorphic
Identified: August 8, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a hand-sized common specimen; higher only if locality, crystals, or unusual mineralization is confirmed.

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 formed by silica replacement or metamorphism of a carbonate-rich parent rock, followed by weathering and dissolution of softer minerals. Exact geological age and locality cannot be determined from the photograph.

Uses & applications

Quartz-rich material may be used as aggregate or decorative stone; intact specimens have modest educational and collector value. It is not sufficiently transparent or crystalline for typical gemstone use.

Geological facts

The honey-brown coloration is consistent with limonite or other iron oxides coating fractures and cavities. A fresh surface should show conchoidal fracture if dominated by quartz.

Field identification & locations

Look for a glassy fracture, quartz hardness (scratches window glass), and acid reaction: strong fizz indicates exposed calcite, while quartz does not fizz. Commonly encountered in weathered silica-rich veins, altered limestone, and quartzite terrains.