sedimentary

Polished Agate or Jasper-Agate

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 6.5-7 (Mohs); Color: Multicolored (red, orange, yellow, translucent blue-grey); Luster: Vitreous/Waxy; Crystal Structure: Cryptocrystalline (Trigonal); Cleavage: None; Specific Gravity: 2.58-2.64

Hardness: 6
Color: Multicolored (red, orange, yellow, translucent blue-grey)
Luster: Vitreous/Waxy

Identified July 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed in volcanic and sedimentary rocks where silica-rich groundwater fills cavities and cracks over time. The vibrant colors are caused by trace inclusions of iron (red/orange) and manganese oxides.

Uses & applications

Used primarily in lapidary arts for jewelry, pocket stones, decorative ornaments, and metaphysical collecting.

Geological facts

Agates and Jaspers are varieties of Chalcedony. While Agate is usually translucent and banded, Jasper is typically opaque; this specimen is a mix of both, often referred to as a jasp-agate.

Field identification & locations

Identify by its waxy luster, hardness (it can scratch glass), and lack of cleavage. Common in riverbeds, glacial deposits, and volcanic regions globally, such as the American Northwest or Brazil.