mineral

Likely iron-rich sulfide ore (possibly sphalerite with oxidized iron minerals)

Appearance may indicate sphalerite (ZnS) with limonite/goethite staining; identification from the image is uncertain.

AI-generated identification · may be incorrect

Dark, metallic to resinous patches occur with rusty yellow-brown weathering and a rough, fractured surface. Sphalerite has Mohs hardness 3.5–4, a cubic crystal structure, and perfect cleavage in six directions; the specimen’s image does not show diagnostic cleavage clearly.

Identified September 26, 2026More mineral →

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At a glance

Common name: Likely iron-rich sulfide ore (possibly sphalerite with oxidized iron minerals)
Scientific name: Appearance may indicate sphalerite (ZnS) with limonite/goethite staining; identification from the image is uncertain.
Category: mineral
Identified: September 26, 2026
Method: Standard

AI Estimated Value

Rough, unverified material: about $1–$20; identifiable, attractive crystal specimens commonly sell for $10–$100+, depending on size and 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

Sphalerite commonly forms in hydrothermal veins and carbonate-hosted replacement deposits, often alongside galena, pyrite, and other sulfides. Iron-oxide staining can form as sulfides weather; age depends on the deposit.

Uses & applications

Sphalerite is the principal zinc ore, used to produce galvanized steel, brass, and zinc chemicals; attractive crystals are collected. Rusty material may have little value without confirmed ore minerals.

Geological facts

Sphalerite can range from pale honey-colored to nearly black, and its streak is typically pale yellow-brown. The photograph alone cannot establish that this specimen contains sphalerite or determine its composition.

Field identification & locations

Check for a pale streak, resinous luster, and characteristic cleavage; a streak plate and mineral tests or laboratory analysis are more reliable than color. Sphalerite occurs in ore districts worldwide, including the United States, Mexico, Peru, and Australia.