mineral

Tumbled banded agate

Microcrystalline quartz (SiO₂), variety agate

AI-generated identification · may be incorrect

Smooth, rounded, pale cream and gray-blue banding with a waxy to vitreous luster. Mohs hardness 6.5–7; trigonal quartz, no cleavage, conchoidal fracture; specific gravity about 2.6. The image suggests agate, though the small specimen’s identity cannot be confirmed from appearance alone.

Identified October 11, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited successive layers in a rock cavity, later solidifying into chalcedony; agate forms in many geological periods, commonly in volcanic rocks.

Uses & applications

Used for jewelry, ornaments, and lapidary collections; larger pieces may be cut or polished for decorative objects.

Geological facts

Agate’s curved or parallel bands form as silica layers accumulate, often preserving subtle changes in fluid chemistry.

Field identification & locations

Look for translucent chalcedony and distinct natural bands; agate occurs worldwide, notably in Brazil, Uruguay, India, and the western United States. A small tumbled piece like this commonly sells for about $1–$10.