sedimentary
Jasper with Quartz Vein
Microcrystalline Quartz (SiO2)
Hardness of 7 on the Mohs scale, waxy luster, opaque with distinct color banding (brown and yellowish-tan) intersected by a lighter quartz vein, conchoidal fracture, no cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, waxy luster, opaque with distinct color banding (brown and yellowish-tan) intersected by a lighter quartz vein, conchoidal fracture, no cleavage, specific gravity of 2.65.
Formation & geological history
Formed through the silification of sedimentary or volcanic rocks where silica-rich fluids precipitated microcrystalline quartz in cavities and fractures over millions of years.
Uses & applications
Used for decorative objects, cabochons, lapidary arts, and as collector specimens.
Geological facts
Jasper is an ancient gemstone and has been used since antiquity for seals, signet rings, and ornamental weapons. The contrasting bands and veins often indicate multiple phases of mineral deposition and tectonic fracturing.
Field identification & locations
Easily identified by its hardness (scratches glass), waxy luster, and distinct color patterns. Often found in riverbeds, glacial tills, and areas of ancient volcanic or hydrothermal activity.
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