mineral

Brecciated quartz/chalcedony nodule

Silica-rich breccia, primarily microcrystalline quartz (SiO₂), with iron-oxide staining and possible drusy quartz

AI-generated identification · may be incorrect

Typically hardness 6.5–7, vitreous to waxy luster, white-gray to brown and black coloration, irregular fracture, and locally sparkly drusy cavities. The angular fragments and translucent silica are consistent with brecciated chalcedony or quartz rather than a uniform crystal.

Identified September 19, 2026More mineral →

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At a glance

Common name: Brecciated quartz/chalcedony nodule
Scientific name: Silica-rich breccia, primarily microcrystalline quartz (SiO₂), with iron-oxide staining and possible drusy quartz
Category: mineral
Identified: September 19, 2026
Method: Standard

AI Estimated Value

Approximately $5–$30 for a common rough specimen; $30–$100+ if unusually attractive, crystalline, or from a documented locality.

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 when silica-rich fragments are cemented by later quartz or chalcedony in fractures, cavities, volcanic rocks, or hydrothermal veins; its precise age and locality cannot be determined from the image. Iron oxides produce the reddish-brown staining.

Uses & applications

Used as a lapidary rough, cabochon material, ornament, and collector specimen; attractive pieces may be polished or cut to expose the brecciation and cavities.

Geological facts

The specimen appears natural but could represent brecciated jasper, agate, or quartz depending on translucency and microscopic texture. A strong glassy luster, conchoidal fracture, and lack of acid reaction support silica.

Field identification & locations

Commonly found in volcanic terrains, hydrothermal veins, and gravel deposits worldwide. Inspect with a 10× loupe and test hardness against glass; locality information or a fresh polished face is needed for confident naming.