sedimentary
Jasper with Quartz Veining
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale); Color: Dark greyish-green base with yellowish quartz/calcite veins; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Dark greyish-green base with yellowish quartz/calcite veins
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Dark greyish-green base with yellowish quartz/calcite veins; Luster: Waxy to vitreous; Crystal Structure: Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.6-2.9.
Formation & geological history
Formed through the deposition of silica from water solutions into cracks and fissures of existing rocks. The veining occurs when the rock undergoes tectonic stress, creating cracks that later fill with secondary minerals like quartz or calcite over millions of years.
Uses & applications
Commonly used for lapidary work, decorative landscaping stones, aquarium gravel, and as a pocket stone for collectors. High-quality specimens are polished for jewelry or metaphysical use.
Geological facts
Jasper is an opaque variety of chalcedony. The name 'Jasper' is derived from the Greek work 'iaspis', meaning 'spotted stone'. This specific specimen is a 'river pebble' which has been naturally tumbled and rounded by water action.
Field identification & locations
Identify in the field by its hardness (it will scratch glass but not be scratched by a steel knife) and smooth, water-worn texture. Commonly found in riverbeds, beaches, and glacial till. Collectors should look for unique vein patterns and contrasting colors.
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