gemstone
White Agate / Chalcedony
Silicon Dioxide (SiO2)
Hardness of 6.5 to 7 on the Mohs scale, milky white to translucent color, waxy to vitreous luster, microcrystalline (cryptocrystalline) quartz structure, conchoidal fracture with no true cleavage, specific gravity of 2.60 to 2.65.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, milky white to translucent color, waxy to vitreous luster, microcrystalline (cryptocrystalline) quartz structure, conchoidal fracture with no true cleavage, specific gravity of 2.60 to 2.65.
Formation & geological history
Formed through the deposition of silica from groundwater, typically in cavities of igneous rocks such as basalt or in sedimentary environments over millions of years.
Uses & applications
Used in jewelry making, ornamental carvings, polished specimens, and metaphysical practices.
Geological facts
Agate has been prized since ancient times, particularly by the ancient Egyptians and Greeks, who used it for signet rings, beads, and protective amulets.
Field identification & locations
Easily identifiable by its waxy luster, microcrystalline texture, and distinct hardness that can scratch glass. Commonly found in riverbeds, gravel deposits, and volcanic regions worldwide.
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