sedimentary
Jasper with Quartz Vein
Microcrystalline quartz (SiO2) and chalcedony with a quartz vein
Hardness: 6.5 to 7 on the Mohs scale. Color: Reddish-brown with a lighter quartz/chalcedony vein. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58 to 2.91.
- Hardness
- 6
- Color
- Reddish-brown with a lighter quartz/chalcedony vein
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5 to 7 on the Mohs scale. Color: Reddish-brown with a lighter quartz/chalcedony vein. Luster: Vitreous to waxy. Crystal structure: Trigonal (microcrystalline/cryptocrystalline). Cleavage: None, exhibits conchoidal fracture. Specific gravity: 2.58 to 2.91.
Formation & geological history
Formed through the precipitation of silica-rich fluids within fractures or cavities in host rocks, often associated with hydrothermal activity or sedimentary deposition in ancient silica-rich environments.
Uses & applications
Used primarily in lapidary arts, ornamental carving, cabochons for jewelry, and as a popular specimen for rock collectors.
Geological facts
Jasper is an opaque variety of chalcedony. The prominent lighter-colored vein running through this specimen indicates a later hydrothermal or secondary mineralizing fluid event that filled a fracture in the host jasper.
Field identification & locations
Can be identified in the field by its high hardness (scratches glass), waxy to vitreous luster, conchoidal fracture, and characteristic opaque red-brown color crossed by mineral veins. Commonly found in riverbeds, glacial tills, and areas with ancient volcanic or hydrothermal activity.
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