mineral

Polished pink chalcedony/agate slab

Microcrystalline quartz (SiO₂), likely pale pink chalcedony with druzy quartz and possible iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; pale pink to lavender, white, and gray; waxy to vitreous luster with sparkling druzy areas. Quartz is trigonal, lacks cleavage, and has specific gravity about 2.6; the specimen appears cut and polished.

Identified August 23, 2026More mineral →

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At a glance

Common name: Polished pink chalcedony/agate slab
Scientific name: Microcrystalline quartz (SiO₂), likely pale pink chalcedony with druzy quartz and possible iron-oxide inclusions
Category: mineral
Identified: August 23, 2026
Method: Standard

AI Estimated Value

Approximately $15–$75 for a common polished slab; $100–$300+ for large, vividly colored, well-patterned, or locality-documented pieces.

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

Silica-rich groundwater deposited cryptocrystalline quartz in cavities or fractures, with later crystallization of fine druzy quartz; coloration commonly reflects iron or other trace elements. Such agates typically form in volcanic rocks during the Cenozoic or older, depending on locality.

Uses & applications

Used for cabochons, decorative slabs, bookends, carvings, and mineral collections; its value is primarily ornamental rather than industrial.

Geological facts

The irregular banding and contrasting pale interior resemble agate or chalcedony, while the sugar-like sparkle indicates druzy quartz. Exact identification and locality require examination of the rough edges, translucency, and any accompanying label.

Field identification & locations

Identify by testing hardness against glass, observing translucent edges, and checking for curved banding and quartz sparkle; it should not be scratched by a steel knife. Common sources include Brazil, Uruguay, Madagascar, Mexico, and the western United States.