sedimentary
Jasper with Iron Oxides
Silicon Dioxide (SiO2) with Fe2O3 inclusions
Hardness: 6.5-7 (Mohs scale), Color: Dull mustard yellow to earthy green and brown, Luster: Vitreous to waxy, Crystal Structure: Microcrystalline (Trigonal), Cleavage: None (Conchoidal fracture)
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Dull mustard yellow to earthy green and brown, Luster: Vitreous to waxy, Crystal Structure: Microcrystalline (Trigonal), Cleavage: None (Conchoidal fracture)
Formation & geological history
Formed from silica-rich groundwater percolating through sedimentary or volcanic ash deposits, often influenced by hydrothermal activity where iron and other minerals provide color.
Uses & applications
Used in lapidary arts for cabochons, beads, and small carvings. Also collected as a common landscape and decorative stone.
Geological facts
Jasper is a variety of chalcedony that contains up to 20% mineral impurities (such as iron or clay), which makes the stone opaque rather than translucent.
Field identification & locations
Identify by its hardness (it will scratch glass) and waxy to dull appearance. This specific specimen shows characteristic iron staining and a grainy, microcrystalline texture common in river or field-found jasper.
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