metamorphic

Milky quartz-bearing metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), possibly with mica and feldspar

AI-generated identification · may be incorrect

White to gray, translucent patches, vitreous to sugary luster, granular interlocking crystals, and no obvious cleavage; quartz hardness is Mohs 7, with quartzite typically having specific gravity around 2.65. The dark areas may be biotite, amphibole, or weathering products.

Identified August 31, 2026More metamorphic →

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At a glance

Common name: Milky quartz-bearing metamorphic rock, likely quartzite
Scientific name: Quartzite, composed predominantly of quartz (SiO₂), possibly with mica and feldspar
Category: metamorphic
Identified: August 31, 2026
Method: Standard

AI Estimated Value

Approximately $1–$10 as an ordinary hand specimen; $10–$30 if unusually attractive, labeled, or from a notable locality.

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

Formed when quartz-rich sandstone was recrystallized under heat and pressure during regional metamorphism; its exact geological age cannot be determined from the photograph. Common in metamorphic mountain belts and ancient continental rocks.

Uses & applications

Used as crushed stone, aggregate, building stone, countertops, and decorative rock; attractive pieces may be collected but this specimen appears ordinary and uncut.

Geological facts

Quartzite commonly fractures across grains rather than around them, unlike weak sandstone. A fresh broken surface is typically hard, glassy, and resistant to scratching.

Field identification & locations

Likely quartzite if it scratches ordinary glass and shows fused-looking grains; a streak test is white, and dilute acid should not fizz. Common worldwide, especially in Precambrian and Paleozoic mountain belts.