gemstone

Dyed and polished agate heart

Microcrystalline quartz (chalcedony), SiO₂; likely druzy quartz inclusions

AI-generated identification · may be incorrect

Hardness 6.5–7 Mohs; turquoise-blue and peach coloration is likely dye, with a pale natural chalcedony band and sparkling druzy surface. Waxy to vitreous luster, cryptocrystalline quartz structure, no obvious cleavage, and specific gravity about 2.6.

Identified August 25, 2026More gemstone →

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Physical properties

Formation & geological history

Agate forms when silica-rich groundwater fills cavities in volcanic rock, commonly during the Cenozoic or older volcanic episodes; later cutting, polishing, and dyeing produced this heart-shaped specimen. The glittering area consists of tiny quartz crystals.

Uses & applications

Used as an inexpensive decorative or lapidary gemstone, paperweight, ornament, or jewelry component; it has modest collector value unless the pattern or locality is exceptional.

Geological facts

Agate is a variety of chalcedony whose bands and colors reflect successive mineral-rich fluid deposits. Dye commonly concentrates in pores, fractures, and druzy zones, producing unusually vivid colors.

Field identification & locations

Identify by translucency, curved or irregular banding, glassy/waxy quartz luster, and hardness that resists scratching by a steel knife; vivid uniform blue-green strongly suggests treatment. Common sources include Brazil, Uruguay, Mexico, India, and Madagascar.