sedimentary
Jasper (Green Jasper / Moss Agate variety)
Silicon Dioxide (SiO2)
Hardness: 6.5-7 on Mohs scale. Color: Pale green to grey-green. Luster: Vitreous to waxy. Crystal Structure: Trigonal (microcrystalline/cryptocrystalline). Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Pale green to grey-green
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 on Mohs scale. Color: Pale green to grey-green. Luster: Vitreous to waxy. Crystal Structure: Trigonal (microcrystalline/cryptocrystalline). Specific Gravity: 2.6-2.9.
Formation & geological history
Formed from silica deposits in sedimentary or volcanic environments, often involving the infiltration of silica-rich fluids into cavities or cracks in other rocks. Associated with ancient volcanic activity and silicate precipitation.
Uses & applications
Commonly used for lapidary work, decorative cabochons, metaphysical crystals, and jewelry. It is also a popular collector's item for those interested in quartz varieties.
Geological facts
Jasper has been a favorite gemstone since antiquity; it is mentioned in several ancient texts and was used as seal stones in Minoan Crete. The green variety is often associated with growth and renewal in historical folklore.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by a steel knife), smooth waxy feel when polished, and opacity. Commonly found in riverbeds or coastal areas where silica-rich rocks have weathered.
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