mineral

Mica-bearing quartz or feldspar fragment

Likely milky quartz (SiO₂), possibly with biotite/muscovite inclusions; feldspar cannot be excluded visually

AI-generated identification · may be incorrect

Translucent milky-white to gray, vitreous-to-waxy luster, irregular fracture with no obvious cleavage, and dark reflective inclusions. Quartz hardness is Mohs 7; feldspar is 6–6.5, so a steel nail test can help distinguish them.

Identified August 20, 2026More mineral →

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At a glance

Common name: Mica-bearing quartz or feldspar fragment
Scientific name: Likely milky quartz (SiO₂), possibly with biotite/muscovite inclusions; feldspar cannot be excluded visually
Category: mineral
Identified: August 20, 2026
Method: Standard

AI Estimated Value

About $1–$10 as an ordinary fragment; up to $20–$50 if exceptionally clear, inclusion-rich, or aesthetically polished.

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 a natural fragment broken from a quartz vein or granitic/pegmatitic rock, formed by cooling silica-rich magma or hydrothermal fluids, commonly from Precambrian to younger continental crust.

Uses & applications

Quartz is used in glass, ceramics, electronics, abrasives, and ornamental specimens; attractive pieces may be polished, though this example appears mainly of collector interest.

Geological facts

The black flecks may be biotite mica, tourmaline, iron-oxide staining, or surface debris; strongly reflective flakes suggest mica inclusions.

Field identification & locations

Common in granite, pegmatite, quartz veins, and stream gravels worldwide. Quartz scratches glass and lacks visible cleavage; feldspar commonly shows two cleavage directions and may appear more opaque.