sedimentary
Jasper River Stone
Silicon Dioxide (SiO2) with iron oxide inclusions
AI-generated identification · may be incorrectHardness: 6.5-7 Mohs; Color: Tan/yellow base with reddish-orange veins; Luster: Dull to waxy; Structure: Microcrystalline quartz (Cryptocrystalline); Conchoidal fracture.
- Hardness
- 6
- Color
- Tan/yellow base with reddish-orange veins
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 Mohs; Color: Tan/yellow base with reddish-orange veins; Luster: Dull to waxy; Structure: Microcrystalline quartz (Cryptocrystalline); Conchoidal fracture.
Formation & geological history
Formed as silica-rich fluids circulated through sedimentary or volcanic rocks, often replacing other minerals. The rounded shape indicates extensive water erosion in a river or coastal environment over thousands of years.
Uses & applications
Commonly used in landscaping, as aquarium decor, or tumbled for lapidary art and jewelry (cabochons).
Geological facts
Jasper is an opaque variety of chalcedony. The red 'veining' seen here is typically caused by the oxidation of iron (hematite) within the stone.
Field identification & locations
Identify by its hardness (it will scratch glass) and lack of visible crystals. Found worldwide in riverbeds and glacial deposits. Collectors value pieces with unique 'landscape' patterns or vibrant contrasting colors.
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