gemstone

Blue Agate Ring

Silicon Dioxide (Chalcedony variety Agate), SiO2

Hardness of 6.5 to 7 on the Mohs scale, vitreous to waxy luster, microcrystalline crystal structure (cryptocrystalline quartz), concoidal fracture with no true cleavage, specific gravity of 2.58-2.64.

Identified August 3, 2026More gemstone →

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Physical properties

Formation & geological history

Agate typically forms in cavities of volcanic and metamorphic rocks through the deposition of silica from groundwater solutions, often in concentric bands.

Uses & applications

Primarily used in jewelry, ornamental carvings, talismans, and as a collectible specimen.

Geological facts

Agate has been used for ornamentation and healing amulets since ancient Babylonian times. Blue agate is frequently treated or dyed to enhance its rich blue hue, though naturally occurring blue chalcedony exists.

Field identification & locations

Can be identified by its distinctive banded patterns or rich translucent color under light. Commonly found worldwide, especially in Brazil, India, Madagascar, and the United States.

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