sedimentary
Jasper with Quartz inclusions
Silicon Dioxide (SiO2) - Microcrystalline Chalcedony
Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow and reddish-brown with white/opaque quartz. Luster: Waxy to vitreous. Crystal Structure: Trigonal/Microcrystalline. Specific Gravity: 2.58-2.91.
- Hardness
- 6
- Color
- Mustard yellow and reddish-brown with white/opaque quartz
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Mustard yellow and reddish-brown with white/opaque quartz. Luster: Waxy to vitreous. Crystal Structure: Trigonal/Microcrystalline. Specific Gravity: 2.58-2.91.
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic ash or sedimentary beds. The inclusions of quartz represent secondary crystallization in fractures (veining). These specimens are often shaped and smoothed through environmental erosion in riverbeds or coastal areas.
Uses & applications
Commonly used in lapidary work for cabochons, decorative carvings, and garden landscaping. High-quality pieces are used in 'worry stones' or metaphysical collections.
Geological facts
Jasper is an opaque variety of chalcedony. Its patterns are created by the consolidation of mineral impurities (iron oxides for the yellows and reds) within the primary silica structure. It has been used since antiquity for royal seals and amulets.
Field identification & locations
Identify in the field by its opacity (it does not transmit light like pure quartz), smooth waxy feel when wet, and inability to be scratched by a steel knife. Common in riverbeds of the American West and coastal Brazil.
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