sedimentary
Green Jasper Pebble
Microcrystalline Quartz (SiO2) with impurities
Hardness: 6.5-7 on the Mohs scale, Color: Various shades of green with mottling or inclusions, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 on the Mohs scale, Color: Various shades of green with mottling or inclusions, Luster: Vitreous to dull, Crystal structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific gravity: 2.58-2.91
Formation & geological history
Formed through the silification of sediment or volcanic ash, where silica-rich fluids replace original materials in sedimentary or hydrothermal environments over millions of years.
Uses & applications
Used for ornamental carvings, polished stones, lapidary art, and rock collecting.
Geological facts
Jasper has been used since ancient times for talismans, seals, and jewelry. The green variety is often colored by iron minerals, chlorite, or clay impurities.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), waxy to dull luster, smooth water-worn surface in riverbeds, and lack of cleavage. Common in stream beds, beaches, and glacial deposits worldwide.
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