sedimentary
Riverstone Jasper
Silicon Dioxide (SiO2) with iron/clay inclusions
Hardness: 6.5-7 Mohs; Color: Olive green with brown crust; Luster: Waxy to dull; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture)
- Hardness
- 6
- Color
- Olive green with brown crust
- Luster
- Waxy to dull
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Physical properties
Hardness: 6.5-7 Mohs; Color: Olive green with brown crust; Luster: Waxy to dull; Structure: Microcrystalline; Cleavage: None (Conchoidal fracture)
Formation & geological history
Formed from silica-rich fluids permeating volcanic ash or sedimentary beds, followed by mechanical weathering in a river environment during the Holocene to Pleistocene epochs.
Uses & applications
Used primarily for lapidary work, jewelry making (cabochons), aquarium decor, and as decorative landscaping gravel.
Geological facts
Jasper is an opaque variety of chalcedony. The smooth, rounded shape of this specimen indicates it has spent significant time being tumbled by water currents in a stream or river bed.
Field identification & locations
Commonly identified by its smooth, water-worn exterior and waxy appearance. Can be found in riverbeds globally, especially in areas with basaltic or sedimentary history.
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