sedimentary
Red Jasper with Quartz Veins
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
Hardness: 6.5-7 on the Mohs scale. Color: Deep reddish-brown with white to yellowish quartz veining. Luster: Waxy to vitreous when wet or polished. Crystal structure: Microcrystalline/Cryptocrystalline trigonal silica. Fracture: Conchoidal.
- Hardness
- 6
- Color
- Deep reddish-brown with white to yellowish quartz veining
- Luster
- Waxy to vitreous when wet or polished
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Physical properties
Hardness: 6.5-7 on the Mohs scale. Color: Deep reddish-brown with white to yellowish quartz veining. Luster: Waxy to vitreous when wet or polished. Crystal structure: Microcrystalline/Cryptocrystalline trigonal silica. Fracture: Conchoidal.
Formation & geological history
Formed when silica-rich fluids precipitated in sedimentary or volcanic environments, incorporating hematite or iron oxides that give the reddish color. White quartz filled subsequent fractures within the pebble. Smoothly rounded by river or ocean water action over time.
Uses & applications
Popular for lapidary work, jewelry making (cabochons), tumbling, decorative accents, and gemstone collecting.
Geological facts
Jasper was one of the most prized gemstones in antiquity and is mentioned frequently in ancient literature and historical artifacts. The red coloration comes from fine particles of hematite dispersed throughout the chalcedony matrix.
Field identification & locations
Identified by its rich reddish-brown color, opaque appearance, high hardness (cannot be scratched by a steel blade), and smooth water-worn surface with contrasting light quartz veining. Commonly found on ocean beaches, gravel bars, and river beds near volcanic or sedimentary regions.
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