metamorphic

Polished green aventurine (likely serpentine or quartzite)

Aventurine quartz, SiO₂; appearance may also resemble serpentinite, mainly Mg₃Si₂O₅(OH)₄

AI-generated identification · may be incorrect

Light green, finely streaked, opaque-to-translucent slab with waxy to vitreous polish; quartz aventurine has Mohs hardness 6.5–7, while serpentine is softer at 2.5–5.5. The image lacks diagnostic crystal or cleavage features.

Identified September 5, 2026More metamorphic →

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At a glance

Common name: Polished green aventurine (likely serpentine or quartzite)
Scientific name: Aventurine quartz, SiO₂; appearance may also resemble serpentinite, mainly Mg₃Si₂O₅(OH)₄
Category: metamorphic
Identified: September 5, 2026
Method: Standard

AI Estimated Value

Approximately $20–$150 for a small polished slab; larger architectural-grade pieces may sell for $100–$500+.

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

Green aventurine forms when quartz crystallizes with fuchsite mica; serpentinite forms by hydrothermal alteration of ultramafic rocks, commonly during oceanic crust or mountain-building processes. Precise age and identification require testing.

Uses & applications

Used for countertops, tiles, decorative slabs, carvings, and cabochons; market value depends strongly on color, pattern, thickness, and whether it is genuine aventurine quartz.

Geological facts

The broad pale-green, flowing texture is especially characteristic of decorative serpentine or green quartzite slabs, often sold commercially under broad trade names such as “green marble.”

Field identification & locations

Check hardness, streak, density, acid reaction, and a fresh edge: quartz scratches glass, whereas serpentine usually does not. Common sources include Brazil, India, China, Italy, and the United States.