mineral

Agate Jasper

Cryptocrystalline Quartz (SiO2) with impurities

Hardness: 6.5-7 on Mohs scale; Color: Red, white, and grey banding; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.6-2.65

Hardness: 6
Color: Red, white, and grey banding
Luster: Vitreous to waxy

Identified January 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed via the deposition of silica from groundwater in the cavities of igneous rocks such as rhyolite or basalt. This specimen displays secondary mineralization in a volcanic matrix, likely dating to the Cenozoic or Mesozoic eras.

Uses & applications

Used extensively in jewelry as cabochons, lapidary arts, decorative carvings, and as a semi-precious gemstone for collectors.

Geological facts

Often called 'Jasp-Agate' when it combines the transparency of agate with the opacity of jasper. This specific specimen features 'fortification' banding typical of lake superior or volcanic agates.

Field identification & locations

Identified in the field by its distinctive concentric banding, hardness (it will scratch glass), and waxy appearance on broken surfaces. Commonly found in regions with ancient volcanic activity like the Lake Superior region, Brazil, or India.

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