sedimentary
Green Jasper
Silicon Dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs). Color: Dark green with possible mottling. Luster: Vitreous to waxy. Crystal structure: Trigonal/Microcrystalline. Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.9.
- Hardness
- 6
- Color
- Dark green with possible mottling
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 6.5-7 (Mohs). Color: Dark green with possible mottling. Luster: Vitreous to waxy. Crystal structure: Trigonal/Microcrystalline. Cleavage: None (conchoidal fracture). Specific gravity: 2.6-2.9.
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic ash or sedimentary beds. The green color is primarily due to the presence of silicate minerals like chlorite or iron inclusions.
Uses & applications
Used widely in lapidary work for making cabochons, beads, and decorative ornaments. Historically used for seals and amulets.
Geological facts
Green jasper was a favorite of the ancient world; many ancient Egyptian amulets were carved from it. It is often referred to as 'The Rain Bringer' in Native American folklore.
Field identification & locations
Identify in the field by its opaque nature (unlike translucent chalcedony), smooth waxy feel, and conchoidal fracture patterns. Commonly found in riverbeds or coastal areas in Oregon, India, and Madagascar.
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