sedimentary
Green Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
Hardness: 6.5-7 on the Mohs scale; Color: Green with brownish or reddish patches; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Green with brownish or reddish patches
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 on the Mohs scale; Color: Green with brownish or reddish patches; Luster: Vitreous to dull; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in sedimentary environments or hydrothermal veins, often replacing organic material or filling cavities in volcanic rocks over millions of years.
Uses & applications
Used for ornamental objects, carvings, lapidary arts, jewelry, and gemstone collection.
Geological facts
Green jasper has been used since ancient times for talismans, seals, and various ornaments. Its green color typically comes from iron minerals or other trace impurities.
Field identification & locations
Can be identified in the field by its hardness (scratches glass), waxy to dull luster, conchoidal fracture, and opaque green coloration. Found worldwide, particularly in regions with ancient volcanic or sedimentary activity.
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