sedimentary
Green Jasper (Agate-Jasper mixture)
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 on Mohs scale; Color: Sage green, olive, or mottled green with tan veins; Luster: Waxy to vitreous when polished, dull when raw; Crystal structure: Microcrystalline/Cryptocrystalline; Specific Gravity: 2.6-2.9
- Hardness
- 6
- Color
- Sage green, olive, or mottled green with tan veins
- Luster
- Waxy to vitreous when polished, dull when raw
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Sage green, olive, or mottled green with tan veins; Luster: Waxy to vitreous when polished, dull when raw; Crystal structure: Microcrystalline/Cryptocrystalline; Specific Gravity: 2.6-2.9
Formation & geological history
Formed through the deposition of silica from volcanic ash or hydrothermal fluids into cavities in rocks. This specimen appears water-worn (tumbled), suggesting it was found in a riverbed or coastal environment. The age can range from tens of millions to hundreds of millions of years depending on the formation site.
Uses & applications
Used primarily in lapidary work for jewelry (cabochons, beads), decorative ornaments, aquarium gravel, and as healing stones in metaphysical practices.
Geological facts
Jasper is typically opaque, but when it contains translucent sections, it is often referred to as 'Jasp-Agate.' The green color is usually caused by the presence of silicate minerals like chlorite or iron inclusions.
Field identification & locations
Identify in the field by its smoothness, lack of visible crystals to the naked eye, and inability to be scratched by a steel knife. Common in the Pacific Northwest (USA), India, and Madagascar. This specific tumbled look is common in river deposits.
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