sedimentary
Tumbled Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Hardness: 6.5-7 (Mohs scale), Color: Forest green with dark inclusions/spotting, Luster: Vitreous to waxy (when polished), Crystal structure: Hexagonal (Microcrystalline), Specific Gravity: 2.6-2.9.
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Forest green with dark inclusions/spotting, Luster: Vitreous to waxy (when polished), Crystal structure: Hexagonal (Microcrystalline), Specific Gravity: 2.6-2.9.
Formation & geological history
Jasper is an opaque variety of chalcedony that forms through the deposition of silica-rich fluids in sedimentary or volcanic environments. The green color is typically caused by inclusions of silicate minerals such as chlorite or actinolite.
Uses & applications
Used primarily in lapidary arts for beads, cabochons, and tumbled stones. It is also used in decorative items and is a popular entry-level mineral for collectors and metaphysical practitioners.
Geological facts
Jasper has been used as a gemstone since antiquity. In the Middle Ages, green jasper was often referred to as 'breath of life' and believed to help with fertility and health. It is an opaque form of quartz, meaning light does not transit through it.
Field identification & locations
Identify in the field by its hardness (will scratch glass and steel), its opaque nature, and smooth conchoidal fracture. Often found as water-worn pebbles in stream beds.
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