mineral

Polished dendritic agate or jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; cream to pale yellow, translucent, with brown-red branching or cloudlike iron staining; waxy to glassy luster and no visible cleavage. Its rounded, polished form is human processed.

Identified September 15, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich groundwater deposited chalcedony in cavities or fractures, while iron oxides produced the brown inclusions; these commonly formed in volcanic rocks during the Cenozoic or older geological episodes. Exact locality and age cannot be determined from the photograph.

Uses & applications

Used as a cabochon, tumbled stone, carving, or collector specimen; durable enough for jewelry and ornamental objects, but not typically used as construction aggregate when sold as a gem material.

Geological facts

The pattern may be dendritic agate if the markings are branching, or iron-stained jasper if the stone is more opaque and massive. Polishing enhances its translucency and color contrast.

Field identification & locations

Identify by its quartz-like hardness, smooth conchoidal fracture if tested, waxy/glassy polish, and lack of cleavage; avoid destructive tests on a finished cabochon. Similar material occurs worldwide, notably India, Brazil, Madagascar, Mexico, and the United States.