sedimentary
Green Jasper
Silicon dioxide (SiO2) with impurities
Hardness: 6.5-7 (Mohs scale); Color: Opaque dark green; Luster: Vitreous to dull; Crystal structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Opaque dark green
- Luster
- Vitreous to dull
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Opaque dark green; 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 from water-rich environments, often in volcanic ash beds or hydrothermal veins where iron minerals provide the green pigmentation. Their smooth appearance suggests river or beach tumbling.
Uses & applications
Primarily used for lapidary work, jewelry (beads and cabochons), decorative ornaments, and as a healing stone in metaphysical communities.
Geological facts
Jasper is an opaque variety of chalcedony. The word 'jasper' comes from the Greek 'iaspis', meaning 'spotted stone'. It was one of the stones used in the breastplate of the High Priest in Biblical times.
Field identification & locations
Identify in the field by its opaque nature (it does not transmit light even at edges) and smooth, waxy feel when water-worn. Common in riverbeds and coastal regions globally, notably in India, Brazil, and the USA.
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