sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron impurities
Hardness: 6.5-7 (Mohs); Color: Yellow to brownish-yellow; Luster: Dull to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow to brownish-yellow
- Luster
- Dull to waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Yellow to brownish-yellow; Luster: Dull to waxy; Crystal Structure: Trigonal (microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the deposition of silica from water solutions into cavities or fissures in sedimentary or volcanic rocks. The yellow color is primarily caused by microscopic inclusions of goethite or limonite (iron oxides).
Uses & applications
Commonly used in lapidary work for cabochons, beads, and carvings. Also used as a decorative stone, in jewelry, and highly popular as a 'healing' or metaphysical crystal.
Geological facts
Jasper was a favorite gem in the ancient world; its name can be traced back in Hebrew, Assyrian, Greek, and Latin. It is an opaque variety of chalcedony that can contain up to 20% foreign materials, which determines its color.
Field identification & locations
Identify by its opacity (unlike translucent citrine), hardness (it will scratch glass), and its smooth, waxy surface when wet or polished. Often found in riverbeds or coastal areas as water-worn pebbles.
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