sedimentary/metamorphic
Jasper and Quartzite Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness: 6.5-7 (Mohs scale); Colors: Red (iron oxide), tan/gray/white (quartzite); Luster: Waxy to vitreous; Texture: Smooth, water-worn, cryptocrystalline structure; Specific Gravity: 2.6-2.9.
- Hardness
- 6
- Luster
- Waxy to vitreous
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Physical properties
Hardness: 6.5-7 (Mohs scale); Colors: Red (iron oxide), tan/gray/white (quartzite); Luster: Waxy to vitreous; Texture: Smooth, water-worn, cryptocrystalline structure; Specific Gravity: 2.6-2.9.
Formation & geological history
Formed through the silicification of fine-grained sedimentary or volcanic ash deposits, later undergo secondary mineralization. This specific specimen is a 'river rock' or 'beach pebble,' indicating it was shaped by fluvial or marine erosion over thousands to millions of years.
Uses & applications
Commonly used for lapidary work (tumbling/polishing), garden landscaping, aquarium decor, and as a semi-precious gemstone for decorative jewelry.
Geological facts
Jasper is often referred to as the 'Supreme Nurturer.' The red coloration in the band is caused by inclusions of Hematite (iron oxide). The smooth, rounded shape is a result of hydraulic action, where constant water movement causes rocks to knock against each other, grinding away sharp edges.
Field identification & locations
Identify in the field by its hardness (cannot be scratched by a steel knife) and smooth, rounded water-worn texture. Commonly found in riverbeds, glacial moraines, and along coastlines globally. Collectors look for unique banding or 'picture' patterns within the stone.
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