mineral

Orange chalcedony geode

Microcrystalline quartz (SiO₂), commonly called carnelian or orange agate when strongly colored

AI-generated identification · may be incorrect

Mohs hardness 6.5–7; translucent orange to reddish-brown, waxy to vitreous luster, cryptocrystalline quartz with conchoidal fracture and no cleavage. The cavity is lined with tiny quartz druzy crystals; iron oxides likely produce the color.

Identified September 6, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich groundwater filled cavities in volcanic rock, depositing chalcedony and later quartz crystals. The specimen’s exact age and host locality cannot be determined from the image; geodes commonly form in Cenozoic to Mesozoic volcanic rocks.

Uses & applications

Used as an ornamental specimen, carving material, beads, cabochons, and occasionally jewelry; attractive geodes are primarily collector pieces rather than construction stone.

Geological facts

Orange chalcedony grades into carnelian, while banded varieties are called agate; these names overlap based on color and pattern. The rough, natural cavity and druzy lining distinguish it from dyed or molded glass.

Field identification & locations

Identify by its waxy translucence, conchoidal fracture, quartz-like druzy, and lack of visible cleavage; common sources include Brazil, Uruguay, Madagascar, India, and Mexico. Avoid prolonged heat or harsh chemicals, which can alter color or damage crystals.