sedimentary
Jasper and Agate Mix
Silicon dioxide (SiO2) - Microcrystalline Quartz
Hardness: 7 on the Mohs scale. Colors include red, brown, grey, and white. Luster is waxy to vitreous. Crystal structure is trigonal (microcrystalline/cryptocrystalline). Cleavage is none, fracture is conchoidal.
- Hardness
- 7 on the Mohs scale
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Physical properties
Hardness: 7 on the Mohs scale. Colors include red, brown, grey, and white. Luster is waxy to vitreous. Crystal structure is trigonal (microcrystalline/cryptocrystalline). Cleavage is none, fracture is conchoidal.
Formation & geological history
Formed via the deposition of silica-rich fluids in cavities, fractures, or sedimentary rock layers over millions of years.
Uses & applications
Used primarily in lapidary arts, ornamental carvings, jewelry, and by mineral collectors.
Geological facts
Jasper and agate are both varieties of chalcedony. When they occur together in the same rock, it typically reflects complex geological conditions where multiple pulses of silica-rich water crystallized under varying chemical environments.
Field identification & locations
Identified by its waxy luster, conchoidal fracture, high hardness (scratches glass easily), and distinctive multicolored banding or patchiness. Common in riverbeds, glacial tills, and areas with volcanic or sedimentary history.
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