sedimentary
Yellow Jasper
Silicon Dioxide with impurities (SiO2)
Hardness: 6.5-7 (Mohs scale); Color: Ochre, mustard yellow, earthy brown tones; Luster: Vitreous to waxy (when polished); Structure: Cryptocrystalline quartz; Cleavage: None, conchoidal fracture.
- Hardness
- 6
- Color
- Ochre, mustard yellow, earthy brown tones
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 6.5-7 (Mohs scale); Color: Ochre, mustard yellow, earthy brown tones; Luster: Vitreous to waxy (when polished); Structure: Cryptocrystalline quartz; Cleavage: None, conchoidal fracture.
Formation & geological history
Formed through the accumulation of fine silica and volcanic ash or silty sediment in hydrothermal or sedimentary environments. The yellow color is caused by the presence of iron (limonite or goethite) within the silicon dioxide matrix.
Uses & applications
Primarily used for lapidary work, jewelry (cabochons and beads), decorative ornaments, and as a collector's stone. Historically used for making tools due to its hardness and durability.
Geological facts
Jasper has been used by ancient civilizations for thousand of years; in ancient Egypt, yellow jasper was often associated with the sun and used in amulets and seals. It is a variety of chalcedony.
Field identification & locations
Identify by its opaque nature, smooth waxy texture when polished, and characteristic earthy yellow-brown patterns. Frequently found in riverbeds or coastal areas in regions like India, Russia, Brazil, and the USA.
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