sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Waxy to dull; Crystal structure: Microcrystalline/Trigonal; Cleavage: None; Specific gravity: 2.58-2.91
- Hardness
- 6
- Color
- Mustard yellow to brownish-yellow
- Luster
- Waxy to dull
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Mustard yellow to brownish-yellow; Luster: Waxy to dull; Crystal structure: Microcrystalline/Trigonal; Cleavage: None; Specific gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water or tectonic hydrothermal activity. Often found in volcanic ash beds or sedimentary environments where iron oxides tint the microcrystalline quartz.
Uses & applications
Used primarily for lapidary work, decorative carvings, jewelry (cabochons), and as a collector's stone or 'healing crystal' in metaphysical circles.
Geological facts
Jasper is an opaque variety of chalcedony. The yellow color is specifically caused by the presence of goethite or limonite (iron) within the silicate matrix.
Field identification & locations
Identify by its waxy luster, conchoidal fracture (smooth, curved breaks), and opacity—unlike citrine, light will not pass through thick pieces. Commonly found in riverbeds and mountainous regions globally.
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