mineral

Tumbled pink chalcedony (probable)

Chalcedony, microcrystalline quartz (SiO₂), possibly pink agate or rose quartz

AI-generated identification · may be incorrect

Translucent pink-orange, waxy to vitreous luster, irregular conchoidal fractures, and no obvious cleavage; hardness about 6.5–7 Mohs, specific gravity near 2.6. The rounded edges indicate tumbling or cutting.

Identified August 25, 2026More mineral →

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Physical properties

Formation & geological history

Forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, commonly during the Cenozoic or older hydrothermal episodes. Its pink color may come from iron, microscopic inclusions, or natural/dye treatment.

Uses & applications

Used for cabochons, carvings, beads, polished stones, and decorative objects; quality depends on color, translucency, pattern, and absence of cracks.

Geological facts

Chalcedony is quartz composed of extremely fine intergrowths of quartz and moganite. A glass-scratch test, lack of cleavage, and waxy appearance help distinguish it from softer pink minerals.

Field identification & locations

Common sources include Brazil, Uruguay, Madagascar, India, Mexico, and the United States. The photograph alone cannot confirm whether this is chalcedony, rose quartz, dyed material, or glass; inspect with a loupe and test hardness carefully.