sedimentary

Green Jasper

Jasper (variety of Microcrystalline Quartz, SiO2)

Hardness: 6.5-7.0 on Mohs scale; Color: Opaque green with earthy/white inclusions; Luster: Vitreous to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91

Hardness: 6
Color: Opaque green with earthy/white inclusions
Luster: Vitreous to waxy

Identified April 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation of fine silica-rich volcanic ash or micro-plankton (radiolarians) that undergo lithification. The green color is typically caused by the presence of iron silicate minerals or chlorite.

Uses & applications

Popular in jewelry making for cabochons and beads, ornamental stone carvings, and as a collector's stone. Historically used for seals and amulets.

Geological facts

Jasper is often referred to as the 'Supreme Nurturer.' Green jasper specifically was highly prized in ancient civilizations, including Egypt, where it was associated with fertility and the underworld.

Field identification & locations

Identify in the field by its extreme hardness (cannot be scratched by a steel knife) and its smooth, waxy surface when damp or polished. Common locations include riverbeds and beaches in Oregon (USA), India, and Brazil.

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