mineral

Honey-brown chalcedony (likely agate)

Microcrystalline quartz, SiO₂; chalcedony, possibly iron-stained agate

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; translucent honey-brown with a waxy to vitreous luster and no obvious cleavage. Quartz crystals are microscopic and commonly form fibrous masses; the thin piece appears naturally fractured or roughly chipped.

Identified October 10, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids deposited quartz in cavities or fractures, potentially with iron oxides producing the brown color. Such deposits form in many ages and settings, especially volcanic rocks and sedimentary veins.

Uses & applications

Used for beads, cabochons, carvings, and decorative objects; chalcedony is also collected as a rough specimen.

Geological facts

Agate is banded chalcedony, but no distinct banding is visible here, so the exact variety cannot be confirmed from the image.

Field identification & locations

Look for translucency, waxy luster, and hardness sufficient to scratch glass; common sources include Brazil, Uruguay, India, and the United States. The image alone does not establish locality or whether it is agate.