sedimentary
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs scale); Color: Reddish-brown, dark brown, and black with white/tan veins; Luster: Dull to waxy (when dry), vitreous in veins; Crystal Structure: Microcrystalline (Cryptocrystalline); Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Reddish-brown, dark brown, and black with white/tan veins
- Luster
- Dull to waxy (when dry), vitreous in veins
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Reddish-brown, dark brown, and black with white/tan veins; Luster: Dull to waxy (when dry), vitreous in veins; Crystal Structure: Microcrystalline (Cryptocrystalline); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed from the deposition of silica in hydrothermal environments or deep-sea sedimentary settings. The fractures were subsequently filled with secondary silica (quartz) to create the veining. Often found in Precambrian or Mesozoic formations.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and decorative carvings. Larger pieces are used as garden stones or aquarium accents.
Geological facts
Jasper is an opaque variety of chalcedony. The red and brown colors are due to varying amounts of hematite or goethite (iron oxides). Some cultures believed Jasper could provide spiritual protection and physical strength.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by a steel knife) and its smooth, water-worn exterior often found in riverbeds. Look for the distinct, sharp-edged veins intersecting the opaque host rock.
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