sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron impurities
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to beige, Luster: Dull to vitreous/waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: Mustard yellow to beige, Luster: Dull to vitreous/waxy, Crystal Structure: Trigonal (microcrystalline), Cleavage: None (conchoidal fracture), Specific Gravity: 2.6-2.9
Formation & geological history
Formed through the deposition of silica from water-saturated environments or volcanic ash during the process of silicification. It is often found in sedimentary layers or near volcanic vents, ranging from millions to billions of years old.
Uses & applications
Commonly used for lapidary work, cabochons for jewelry, decorative carvings, and as a popular specimen for rock collectors and practitioners of crystal healing.
Geological facts
Jasper is an opaque variety of chalcedony. The yellow hue is primarily due to the presence of goethite or other iron oxides. Historically, it was known as a stone of endurance and protection.
Field identification & locations
Identify by its waxy luster, opacity (does not let light through even at edges), and conchoidal fracture. Found worldwide, with notable deposits in the USA, India, and Australia. In the field, look for smooth, rounded pebbles in riverbeds or thick veins in host rock.
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