mineral

Pale green tumbled mineral, likely prehnite

Prehnite — Ca₂Al(AlSi₃O₁₀)(OH)₂; identification is provisional from the photograph

AI-generated identification · may be incorrect

Pale yellow-green, translucent, vitreous to pearly luster, apparently polished/tumbled with no visible crystal faces. Mohs hardness 6–6.5; specific gravity about 2.8–2.95; typically orthorhombic and commonly botryoidal or massive, with imperfect cleavage.

Identified September 7, 2026More mineral →

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At a glance

Common name: Pale green tumbled mineral, likely prehnite
Scientific name: Prehnite — Ca₂Al(AlSi₃O₁₀)(OH)₂; identification is provisional from the photograph
Category: mineral
Identified: September 7, 2026
Method: Standard

AI Estimated Value

About $2–$15 for a small common tumbled piece; $20–$100+ for unusually clear, well-colored lapidary material. A photograph alone cannot distinguish it confidently from glass or other green minerals.

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

Forms as a low-temperature hydrothermal mineral in cavities and fractures of basalt and other volcanic rocks, often alongside zeolites and quartz. It is commonly associated with relatively young volcanic terrains, though its exact age cannot be determined visually.

Uses & applications

Used mainly as a collectible or lapidary stone; attractive translucent material is cut into cabochons and beads. It has little industrial or construction value.

Geological facts

The specimen appears to sit on a metal surface, but its pale green translucent appearance is consistent with polished prehnite. Similar-looking alternatives include pale jade/nephrite, serpentine, chrysoprase, fluorite, or dyed glass.

Field identification & locations

Prehnite is common in basaltic volcanic provinces, including parts of northeastern Queensland, making it regionally plausible near Townsville. Confirm with hardness testing: it should scratch glass but not quartz; check specific gravity and avoid destructive testing if valuable.