mineral

Polished purple-gray stone, possibly lepidolite or purple jasper

Lepidolite (K(Li,Al)₃(Si,Al)₄O₁₀(F,OH)₂) or quartz-rich jasper

AI-generated identification · may be incorrect

The rounded, polished specimen appears lavender-gray with a dull to waxy luster and an embedded darker vein or cavity. Lepidolite has Mohs hardness 2.5–3.5 and basal cleavage; jasper is quartz-rich, about 6.5–7, with no obvious cleavage. The image alone cannot reliably distinguish them.

Identified August 15, 2026More mineral →

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At a glance

Common name: Polished purple-gray stone, possibly lepidolite or purple jasper
Scientific name: Lepidolite (K(Li,Al)₃(Si,Al)₄O₁₀(F,OH)₂) or quartz-rich jasper
Category: mineral
Identified: August 15, 2026
Method: Standard

AI Estimated Value

About $5–$30 for a common polished specimen; $30–$100+ if it is confirmed high-quality lepidolite or an attractive, well-documented jasper.

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

Lepidolite forms in lithium-rich granite pegmatites during late-stage crystallization; jasper forms when silica-rich fluids replace or cement sedimentary or volcanic material. Precise age and locality are unavailable from the photograph.

Uses & applications

Lepidolite is collected for its color and lithium-bearing mica; jasper is used for cabochons, carvings, tumbled stones, and ornamental objects. This appears primarily decorative or lapidary.

Geological facts

Purple coloration may result from manganese, iron, mica, or other trace elements. A hardness test, streak, and close examination of mica-like cleavage would help separate lepidolite from jasper.

Field identification & locations

Common sources include Brazil, Madagascar, and the western United States for lepidolite, and worldwide volcanic or sedimentary terrains for jasper. Avoid destructive testing if it is a valued polished piece.