sedimentary
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Hardness (Mohs): 6.5-7; Color: Olive green to deep forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Color
- Olive green to deep forest green
- Luster
- Vitreous to waxy
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Physical properties
Hardness (Mohs): 6.5-7; Color: Olive green to deep forest green; Luster: Vitreous to waxy; Crystal structure: Trigonal/Microcrystalline; Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the infiltration of silica-rich fluids into volcanic ash or fine-grained sedimentary layers, typically during the hydrothermal process or as secondary deposits in cavities.
Uses & applications
Used primarily in lapidary arts for cabochons, beads, and decorative carvings. It is also highly popular as a collector's pocket stone or used in metaphysical practices.
Geological facts
Jasper is an opaque variety of chalcedony. The green color in this specimen is usually caused by the presence of chlorite or iron silicate minerals like iron-rich actinolite.
Field identification & locations
Identify by its opacity (even on thin edges), smooth waxy feel, and conchoidal fracture patterns. Commonly found in river beds, beaches, and desert regions worldwide.
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