sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz
Hardness: 6.5 - 7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Dull to waxy, Crystal Structure: Hexagonal (Microcrystalline), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58 - 2.91
- Hardness
- 6
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Physical properties
Hardness: 6.5 - 7 (Mohs scale), Color: Mustard yellow to brownish-yellow, Luster: Dull to waxy, Crystal Structure: Hexagonal (Microcrystalline), Cleavage: None (Conchoidal fracture), Specific Gravity: 2.58 - 2.91
Formation & geological history
Formed from the deposition of silica from water solutions or volcanic ash into sedimentary environments; the yellow color is typically caused by iron oxide (goethite) inclusions. It can form in various geological ages.
Uses & applications
Used primarily as a gemstone for jewelry (cabochons, beads), decorative carvings, and as a popular specimen for rock tumbling and metaphysical collections.
Geological facts
Jasper has been used as a sacred stone by various cultures for millennia. Yellow Jasper specifically is often referred to as a 'stone of endurance' in metaphysical circles and has been used in amulets since ancient times.
Field identification & locations
Identify in the field by its opacity (unlike translucent citrine), its hardness (will scratch glass), and its smooth, waxy feel when water-worn. Commonly found in riverbeds or desert regions globally.
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