gemstone
Tumbled Agate
Silicon dioxide, SiO2
AI-generated identification · may be incorrectMohs hardness of 6.5 to 7. Color ranges from gray, brown, and white to various earthy tones. Exhibits a waxy to vitreous luster with a cryptocrystalline structure.
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Physical properties
Mohs hardness of 6.5 to 7. Color ranges from gray, brown, and white to various earthy tones. Exhibits a waxy to vitreous luster with a cryptocrystalline structure.
Formation & geological history
Forms by the deposition of silica from groundwater in the cavities of igneous and sedimentary rocks. Occurs globally in diverse geological environments.
Uses & applications
Widely used in jewelry, decorative carvings, metaphysical practices, and lapidary art.
Geological facts
Agate has been prized since antiquity for use in seals, rings, and ornamental vessels. Its banded varieties are formed in successive layers within volcanic cavities.
Field identification & locations
Identified by its microcrystalline texture, conchoidal fracture, and resistance to scratching by steel. Common worldwide, especially in volcanic rock regions.
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