sedimentary (microcrystalline silicate)
Jasper (likely river-tumbled)
Jasper (Silica/Silicon Dioxide, SiO2)
Hardness: 6.5–7 on Mohs scale; Color: Mottled green, brown, and yellowish-tan; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91.
- Hardness
- 6
- Color
- Mottled green, brown, and yellowish-tan
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5–7 on Mohs scale; Color: Mottled green, brown, and yellowish-tan; Luster: Waxy to vitreous; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91.
Formation & geological history
Formed through the deposition of silica from water-rich environments or volcanic ash. This specimen appears water-worn and weathered, suggesting it was transported via a river or stream bed where mechanical erosion rounded its edges over time.
Uses & applications
Commonly used for lapidary work, cabochons for jewelry, decorative tumbling, and as an ornamental stone in landscaping or interior design.
Geological facts
Jasper is an opaque variety of chalcedony. The name comes from the Greek word 'iaspis', meaning 'spotted stone'. It has been used since antiquity for seals, amulets, and even tools due to its toughness and ability to hold a sharp edge when fractured.
Field identification & locations
Identify in the field by its opacity (does not transmit light), waxy feel when smooth, and its hardness (it will scratch glass). Commonly found in gravel pits, riverbeds, and desert pavements globally. Collectors value it for its unique patterns and colors.
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