mineral

Blue aventurine or dyed blue quartz crescent

Quartz, silicon dioxide (SiO₂), likely aventurine quartz; exact identification requires testing

AI-generated identification · may be incorrect

Hardness about 7 Mohs, blue color with a vitreous luster and possibly fine glitter from included minerals; massive/microcrystalline rather than visibly crystalline, with no obvious cleavage. The crescent shape appears carved and polished.

Identified August 23, 2026More mineral →

Explore Blue aventurine or dyed blue quartz crescent in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

At a glance

Common name: Blue aventurine or dyed blue quartz crescent
Scientific name: Quartz, silicon dioxide (SiO₂), likely aventurine quartz; exact identification requires testing
Category: mineral
Identified: August 23, 2026
Method: Standard

AI Estimated Value

About $5–$25 for a small carved common piece; $30–$100 if verified as attractive natural blue aventurine or a high-quality lapidary specimen.

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

Quartz forms in silica-rich hydrothermal veins and igneous or metamorphic environments; aventurine’s color commonly comes from mineral inclusions, while strong uniform blue may indicate dyeing. Geological age is specimen-dependent.

Uses & applications

Used as a decorative carving, cabochon, jewelry component, or collectible; blue aventurine is generally inexpensive.

Geological facts

The image alone cannot distinguish natural blue aventurine from dyed quartz, blue calcite, or glass. A scratch test, magnification, and specific-gravity/refractive-index testing would improve identification.

Field identification & locations

Quartz should resist scratching by a steel knife, whereas calcite will not; inspect edges and fractures for concentrated dye and check for bubbles or flow texture suggesting glass. Aventurine quartz occurs notably in India, Brazil, Russia, and Tanzania.