sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
Hardness: 6.5-7 (Mohs); Color: Yellow to brownish-yellow; Luster: Dull to vitreous/waxy; Crystal System: Trigonal (Microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
- Hardness
- 6
- Color
- Yellow to brownish-yellow
- Luster
- Dull to vitreous/waxy
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Physical properties
Hardness: 6.5-7 (Mohs); Color: Yellow to brownish-yellow; Luster: Dull to vitreous/waxy; Crystal System: Trigonal (Microcrystalline); Cleavage: None (conchoidal fracture); Specific Gravity: 2.58-2.91
Formation & geological history
Formed through the accumulation of fine-grained silica in sedimentary environments or hydrothermal veins. Its yellow color is derived from iron hydroxide (goethite) inclusions during the solidification process.
Uses & applications
Used primarily in lapidary work for cabochons, beads, and decorative carvings. It is also used as a gemstone in jewelry and collected as a healing stone in metaphysical communities.
Geological facts
Jasper is an opaque variety of chalcedony. It has been used since ancient times for cylinder seals and amulets, and was often mentioned in various ancient religious texts for its protective qualities.
Field identification & locations
Identify by its hardness (will scratch glass), opaque nature, and smooth, waxy texture when polished. Commonly found in riverbeds or coastal areas as rounded pebbles. Major sources include India, Brazil, and the USA.
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