sedimentary
Jasper (Green Jasper / Bloodstone variant base)
Silicon Dioxide (SiO2) with impurities of chlorite and iron oxides
Hardness: 6.5-7 on Mohs scale; Color: Deep forest green with brownish-yellow iron inclusions; Luster: Dull/waxy (glassy when wet as shown); Crystal Structure: Microcrystalline/Cryptocrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91
- Hardness
- 6
- Color
- Deep forest green with brownish-yellow iron inclusions
- Luster
- Dull/waxy (glassy when wet as shown)
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Physical properties
Hardness: 6.5-7 on Mohs scale; Color: Deep forest green with brownish-yellow iron inclusions; Luster: Dull/waxy (glassy when wet as shown); Crystal Structure: Microcrystalline/Cryptocrystalline (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58–2.91
Formation & geological history
Formed through the deposition of silica-rich fluids in volcanic ash or sedimentary beds, often during the Paleozoic or Mesozoic eras. The green color comes from chlorite or actinolite inclusions during hydrothermal alteration.
Uses & applications
Used primarily in lapidary arts for jewelry, cabochons, and decorative carvings. Historically used for seal stones and amulets. In industry, it can be used for grinding media, though higher-quality pieces are reserved for collecting.
Geological facts
Jasper is a variety of chalcedony. Historically, green jasper was associated with fertility and rain-bringing rituals. It is so dense that it is essentially opaque, unlike its cousin agate, which is translucent.
Field identification & locations
Identify in the field by its smooth, river-worn texture, high hardness (cannot be scratched by a steel knife), and typical conchoidal (shell-like) fracture edges. Commonly found in riverbeds, glacial tills, and coastal regions in areas like the Pacific Northwest, India, and Australia.
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