metamorphic

Milky quartz-rich rock, likely quartzite or quartz vein material

Quartz (SiO₂), probably intergrown with feldspar and weathered mica/clay minerals

AI-generated identification · may be incorrect

Hardness about 7 Mohs for fresh quartz; white, gray, tan, and rusty-brown, with a vitreous to dull luster and massive, non-cleaved texture. The rounded surface appears naturally weathered or tumbled, and iron staining causes the yellow-brown areas.

Identified September 4, 2026More metamorphic →

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At a glance

Common name: Milky quartz-rich rock, likely quartzite or quartz vein material
Scientific name: Quartz (SiO₂), probably intergrown with feldspar and weathered mica/clay minerals
Category: metamorphic
Identified: September 4, 2026
Method: Standard

AI Estimated Value

About $1–$10 for a common hand specimen; approximately $10–$40 if unusually attractive, well-crystallized, or display-quality.

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 from silica-rich metamorphic rock or hydrothermal quartz-vein material; quartz veins can form at various geological ages when hot fluids deposit silica in fractures. Exact age and classification require testing or a fresh broken surface.

Uses & applications

Common quartzite is used as aggregate, building stone, landscaping rock, and sometimes countertops; attractive pieces are collected but are generally low-value unless unusually clear, patterned, or associated with rare minerals.

Geological facts

Quartz typically shows conchoidal fracture rather than cleavage and can scratch ordinary glass. The specimen’s granular, brecciated appearance may indicate quartzite or a weathered quartz vein rather than a single crystal.

Field identification & locations

Commonly found in quartz veins, metamorphic terrains, and stream gravels worldwide. Confirm with a glass-scratch test, lack of acid reaction, and inspection for crystalline quartz; a streak, hardness, and chemical test would improve identification.