gemstone
Yellow Agate
Silicon Dioxide (Chalcedony), SiO2
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale, yellow to orange color, waxy to vitreous luster, microcrystalline (cryptocrystalline) crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.64.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, yellow to orange color, waxy to vitreous luster, microcrystalline (cryptocrystalline) crystal structure, conchoidal fracture with no true cleavage, specific gravity of 2.58 to 2.64.
Formation & geological history
Formed within the cavities of volcanic and metamorphic rocks through the deposition of silica-rich groundwater solutions over millions of years.
Uses & applications
Used primarily in jewelry, ornamental carvings, polished specimens, and lapidary art.
Geological facts
Agate has been used by humans for thousands of years, dating back to Neolithic times for tools and ornamentation, and was highly prized in ancient Greece and Rome for signet rings.
Field identification & locations
Easily identified by its waxy luster, microcrystalline texture, and hardness that can scratch glass. Commonly found in riverbeds, beaches, and volcanic regions worldwide.
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