mineral

Quartz-rich vein fragment, possibly quartz with mica or calcite

Quartz (SiO₂), with probable muscovite/biotite mica and minor feldspar or calcite

AI-generated identification · may be incorrect

White to translucent, vitreous to pearly luster, irregular crystalline texture, and no obvious cleavage in the quartz; quartz hardness is Mohs 7, while associated mica is softer and flaky. The elongated form appears natural and unpolished, but a photograph cannot confirm mineral identity or hardness.

Identified September 13, 2026More mineral →

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At a glance

Common name: Quartz-rich vein fragment, possibly quartz with mica or calcite
Scientific name: Quartz (SiO₂), with probable muscovite/biotite mica and minor feldspar or calcite
Category: mineral
Identified: September 13, 2026
Method: Standard

AI Estimated Value

About $2–$15 as an unattributed common specimen; higher only if testing reveals a rare associated mineral or 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

Likely formed as hydrothermal vein material filling fractures in older igneous or metamorphic rock; associated host rocks may range from Paleozoic to Precambrian age depending on locality. The specimen may also contain weathered feldspar or carbonate minerals.

Uses & applications

Quartz is used in glass, ceramics, electronics, abrasives, and ornamental specimens; attractive crystalline pieces are collected but this example appears modest in commercial value.

Geological facts

Quartz commonly forms six-sided prisms, though massive vein quartz can be irregular. A steel nail should not scratch quartz, whereas a knife may scratch mica or calcite.

Field identification & locations

Look for glassy translucence, conchoidal fracture, and hardness; fizzing in dilute hydrochloric acid would suggest calcite, not quartz. Common in hydrothermal veins worldwide, including Brazil, the United States, Madagascar, and China.