sedimentary
Jasper (specifically Oolitic or Brecciated Jasper)
Silicon Dioxide (SiO₂)
Hardness: 6.5-7 (Mohs scale); Color: Dark reddish-brown with cream and tan inclusions; Luster: Vitreous to waxy (especially when wet); Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Dark reddish-brown with cream and tan inclusions
- Luster
- Vitreous to waxy (especially when wet)
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Dark reddish-brown with cream and tan inclusions; Luster: Vitreous to waxy (especially when wet); Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9.
Formation & geological history
Formed through the deposition of silica from water. The reddish color comes from iron oxides. Often found as water-worn nodules in riverbeds or coastal areas where ancient sedimentary layers have eroded.
Uses & applications
Used primarily for ornamental purposes, lapidary arts (cabochons, beads), and as a collector's specimen. Known as a 'nurturing stone' in metaphysical communities.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek 'iaspis', meaning spotted stone, referring to its typically variegated appearance.
Field identification & locations
Identify by its hardness (it will scratch glass) and its opaque, waxy appearance. Commonly found in gravel pits or along stony beaches and river banks where silica-rich rocks are present.
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