sedimentary
Agate with Fossil/Inclusion
Silicon Dioxide (SiO2) with chalcedony and potential fossil inclusion
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.60 to 2.65, multicolored banding with earthy exterior and white fossiliferous inclusions.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, waxy to vitreous luster, cryptocrystalline crystal structure, conchoidal fracture, specific gravity around 2.60 to 2.65, multicolored banding with earthy exterior and white fossiliferous inclusions.
Formation & geological history
Formed in cavities of volcanic and metamorphic rocks through the slow deposition of silica-rich groundwater over millions of years, often during the Cenozoic or Mesozoic eras.
Uses & applications
Used primarily in lapidary arts, jewelry, as decorative stones, and prized by collectors for unique natural inclusions.
Geological facts
Agate has been used since antiquity for ornaments, seals, and healing talismans; specimens with embedded fossils or unusual matrix contrasts are particularly unique.
Field identification & locations
Found in gravel beds, riverbeds, and weathered rock outcrops globally. Identify by its hardness, waxy luster, and conchoidal fracture.
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