sedimentary
Jasper with Quartz inclusions
Silicon Dioxide (SiO2)
Hardness: 6.5-7 (Mohs); Color: Reddish-brown, tan, and cream with translucent quartz zones; Luster: Dull to Vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (Conchoidal fracture)
- Hardness
- 6
- Color
- Reddish-brown, tan, and cream with translucent quartz zones
- Luster
- Dull to Vitreous
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Reddish-brown, tan, and cream with translucent quartz zones; Luster: Dull to Vitreous; Crystal Structure: Microcrystalline/Trigonal; Cleavage: None (Conchoidal fracture)
Formation & geological history
Formed from the deposition of silica-rich fluids in volcanic ash or sedimentary beds, typically over millions of years during the Phanerozoic Eon. The brown hues indicate the presence of iron oxides.
Uses & applications
Used primarily for lapidary work (cabochons), jewelry, ornamental carvings, and as a popular specimen for amateur rock collectors.
Geological facts
Jasper has been used by ancient civilizations for making tools and seals. It is a variety of chalcedony that is opaque due to its high mineral impurity content.
Field identification & locations
Identify in the field by its waxy-to-dull luster, hardness (will scratch glass), and opaque nature compared to transparent quartz. Found globally in riverbeds and mountainous terrain.
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