mineral
Jasper Agate
Silicon dioxide (SiO2)
Hardness: 6.5-7 (Mohs); Color: Reddish-brown with white banding; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.64
- Hardness
- 6
- Color
- Reddish-brown with white banding
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Reddish-brown with white banding; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.64
Formation & geological history
Formed through the deposition of silica from groundwater in cavities of igneous rocks or through replacement of organic material; typically Mesozoic to Cenozoic in age.
Uses & applications
Commonly used in lapidary work for cabochons, beads, decorative carvings, and as a pocket stone for collectors.
Geological facts
Jasper and agate are both chalcedony; jasper is opaque while agate is translucent. Specimens like this one that show both characteristics are often grouped together by collectors as Jasper-Agates.
Field identification & locations
Identify by its waxy luster, hardness (will scratch glass), and characteristic bands. Commonly found in river beds, beaches, and volcanic regions globally, specifically prominent in the Pacific Northwest and Lake Superior regions.
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