mineral

Small agate or chalcedony fragment

Microcrystalline quartz (SiO₂), likely banded chalcedony/agate

AI-generated identification · may be incorrect

Tiny curved fragment with orange-brown and dark gray coloring and a waxy to glassy luster. Quartz hardness is 7; crystals are microscopic and cleavage is absent, with conchoidal fracture.

Identified October 15, 2026More mineral →

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Physical properties

Tiny curved fragment with orange-brown and dark gray coloring and a waxy to glassy luster. Quartz hardness is 7; crystals are microscopic and cleavage is absent, with conchoidal fracture.

Formation & geological history

Silica-rich groundwater deposited quartz in cavities or fractures, potentially forming agate bands; the image does not establish its geological age or exact source.

Uses & applications

Agate is used for jewelry, beads, carvings, and decorative objects; this very small fragment is mainly of modest collecting interest.

Geological facts

Chalcedony is a compact aggregate of microscopic quartz crystals, and agate is its banded variety.

Field identification & locations

Look for translucency, curved conchoidal fracture, and distinct color bands; agate occurs worldwide, including Brazil, Uruguay, India, and the western United States. The fragment is too small for confident identification from the image alone.