sedimentary
Yellow Jasper (Chert/Quartz Pebble)
Silicon Dioxide (SiO2 with iron oxide inclusions)
Hardness: 6.5-7 Mohs. Color: Yellowish-brown to tan. Luster: Waxy to dull. Structure: Microcrystalline/cryptocrystalline quartz. Cleavage: None (conchoidal fracture). Specific Gravity: 2.6-2.65.
- Hardness
- 6
- Color
- Yellowish-brown to tan
- Luster
- Waxy to dull
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Physical properties
Hardness: 6.5-7 Mohs. Color: Yellowish-brown to tan. Luster: Waxy to dull. Structure: Microcrystalline/cryptocrystalline quartz. Cleavage: None (conchoidal fracture). Specific Gravity: 2.6-2.65.
Formation & geological history
Formed when silica-rich waters precipitate microcrystalline quartz inside sedimentary rocks or volcanic cavities, with iron hydroxides providing the yellow coloration. Smooth rounded shape results from fluvial or coastal erosion.
Uses & applications
Used for lapidary arts, tumbling, decorative landscaping, bead making, and crystal collecting.
Geological facts
Jasper has been used since antiquity for seals, amulets, and ornamental carvings. Yellow jasper derives its warm color from fine particles of goethite or limonite embedded within the quartz matrix.
Field identification & locations
Identified by its hardness (scratches glass), smooth water-worn surface, and dull to waxy luster. Commonly found along riverbeds, gravel pits, and beaches worldwide.
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