mineral

Botryoidal chalcedony with druzy quartz (possibly aragonite/calcite cavity fill)

Microcrystalline quartz, SiO₂; associated carbonate minerals may be calcite (CaCO₃) or aragonite (CaCO₃)

AI-generated identification · may be incorrect

Cream, tan, and honey-brown; waxy to vitreous luster with rounded botryoidal surfaces and porous vugs. Quartz hardness is about 6.5–7 Mohs, noncleavable, cryptocrystalline, and typically has specific gravity near 2.6.

Identified September 6, 2026More mineral →

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At a glance

Common name: Botryoidal chalcedony with druzy quartz (possibly aragonite/calcite cavity fill)
Scientific name: Microcrystalline quartz, SiO₂; associated carbonate minerals may be calcite (CaCO₃) or aragonite (CaCO₃)
Category: mineral
Identified: September 6, 2026
Method: Standard

AI Estimated Value

Approximately $15–$100 for a common hand specimen; unusually aesthetic, locality-documented pieces may bring $150–$500.

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

Likely formed when silica-rich groundwater deposited successive chalcedony layers in cavities or porous volcanic/limestone material; later carbonate minerals may have crystallized in open spaces. Exact age and locality cannot be determined from the photograph.

Uses & applications

Used as a decorative and lapidary stone, cabinet specimen, and occasionally for polished slices or carvings; generally not suitable for major construction use.

Geological facts

The grape-like “botryoidal” texture forms through repeated precipitation around bubbles, cavities, or irregular surfaces. Dark holes are natural vugs, some potentially lined with microscopic druzy quartz.

Field identification & locations

Identify by its waxy translucence, concentric banding, rounded growths, and hardness exceeding glass; distinguish from ordinary limestone by its silica-rich, tougher surfaces. Common occurrences include volcanic cavities and hydrothermal veins worldwide.