sedimentary
Jasper
Silicon dioxide (SiO2)
Hardness: 6.5-7 (Mohs); Color: Reddish-brown with light quartz veining; Luster: Dull to waxy when raw, vitreous when wet or polished; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture).
- Hardness
- 6
- Color
- Reddish-brown with light quartz veining
- Luster
- Dull to waxy when raw, vitreous when wet or polished
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Reddish-brown with light quartz veining; Luster: Dull to waxy when raw, vitreous when wet or polished; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture).
Formation & geological history
Formed through the deposition of silica from water-rich environments, often in volcanic ash or sedimentary layers. The red-brown color is typically due to iron inclusions.
Uses & applications
Used primarily for ornamental purposes, jewelry (lapidary), spiritual practices, and as landscaping stones or collectable river stones.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since ancient times for cylinder seals and amulets. It is often called the 'supreme nurturer' in metaphysical circles.
Field identification & locations
Identify in the field by its hardness (will scratch glass), opaque nature, and smooth, water-worn texture if found in riverbeds. Common in rocky outcrops and riverbanks globally.
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