metamorphic

Polished lapis lazuli and quartz stones

Lapis lazuli: lazurite-rich metamorphic rock, chiefly (Na,Ca)8(AlSiO4)6(S,SO)4; quartz: SiO₂

AI-generated identification · may be incorrect

Blue stones are lapis lazuli, with deep blue lazurite, white calcite, and occasional pyrite; clear stones are quartz. Both have vitreous to waxy luster; quartz hardness is 7, while lapis lazuli is about 5–5.5, with granular crystal structure and no prominent cleavage.

Identified September 19, 2026More metamorphic →

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At a glance

Common name: Polished lapis lazuli and quartz stones
Scientific name: Lapis lazuli: lazurite-rich metamorphic rock, chiefly (Na,Ca)8(AlSiO4)6(S,SO)4; quartz: SiO₂
Category: metamorphic
Identified: September 19, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 per tumbled stone; fine, intensely blue lapis or larger quality pieces may reach $50–$200+, while common quartz pieces are usually $2–$20.

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

Lapis lazuli formed by contact metamorphism of carbonate rocks, commonly in Precambrian deposits such as Afghanistan’s Sar-e-Sang region; quartz formed from silica-rich fluids or igneous processes. The specimens are tumbled and polished.

Uses & applications

Lapis lazuli is used for beads, carvings, ornaments, and the historic pigment ultramarine; quartz is used in jewelry, décor, glass, electronics, and industrial abrasives.

Geological facts

The strongest blue lapis is generally most valuable, while visible golden pyrite can add appeal; abundant white calcite lowers gem quality. Quartz commonly shows internal fractures and cloudy veils.

Field identification & locations

Identify lapis by its opaque royal-blue color, white calcite veining, and possible metallic pyrite flecks; quartz is transparent to translucent and scratches glass. Common sources include Afghanistan, Chile, Russia, Brazil, and Madagascar.