mineral

Yellow quartz-bearing rock, possibly sulfur-stained quartz or calcite

Indeterminate; likely quartz (SiO₂) and/or calcite (CaCO₃) with yellow iron/sulfur staining

AI-generated identification · may be incorrect

Pale yellow, irregular massive specimen with a dull to weakly vitreous luster; apparent hardness is uncertain—quartz is Mohs 7, while calcite is Mohs 3 and fizzes in dilute hydrochloric acid. No clear crystal structure or cleavage is visible; the dark attached material may be matrix rock or packaging residue.

Identified September 14, 2026More mineral →

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At a glance

Common name: Yellow quartz-bearing rock, possibly sulfur-stained quartz or calcite
Scientific name: Indeterminate; likely quartz (SiO₂) and/or calcite (CaCO₃) with yellow iron/sulfur staining
Category: mineral
Identified: September 14, 2026
Method: Standard

AI Estimated Value

Approximately $2–$20 for an ordinary small specimen; $25–$100+ if confirmed as attractive native sulfur or well-crystallized material.

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 hydrothermal or mineral-vein specimen formed when hot fluids deposited silica or carbonate minerals in fractures, later stained yellow by sulfur-bearing or iron-rich compounds. Geological age cannot be determined from the image.

Uses & applications

Common specimens have modest value and are mainly used for teaching or collecting; quartz and calcite are important industrial minerals, while attractive transparent crystals may be used decoratively or in jewelry.

Geological facts

The yellow color is not diagnostic: it may reflect native sulfur, iron oxides, altered calcite, or artificial coating. A streak test, hardness test, and acid test would substantially improve identification.

Field identification & locations

Check whether it scratches glass (quartz), leaves a white/yellow streak, or effervesces with dilute acid (calcite). Similar material occurs in hydrothermal veins and sulfur-rich volcanic regions worldwide.