sedimentary
Yellow Jasper
Cryptocrystalline Quartz (SiO2)
Hardness of 6.5-7 on the Mohs scale. Features a mustard yellow to golden-brown color due to iron oxide inclusions. It has a dull to waxy luster, a conchoidal fracture, and is opaque to slightly translucent.
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Physical properties
Hardness of 6.5-7 on the Mohs scale. Features a mustard yellow to golden-brown color due to iron oxide inclusions. It has a dull to waxy luster, a conchoidal fracture, and is opaque to slightly translucent.
Formation & geological history
Formed through the deposition of silica-rich fluids within volcanic ash or sedimentary beds. The color is derived from high iron content (Goethite) during the mineralization process over millions of years.
Uses & applications
Predominantly used as a gemstone for cabochons, beads, and carvings. It is also used in decorative architectural finishes and is popular among metaphysical collectors as a 'stone of protection.'
Geological facts
Jasper is an impure variety of silica. The name 'Jasper' is derived from the Greek word 'iaspis', meaning 'spotted stone.' Yellow Jasper specifically was used by ancient civilizations for amulets to ensure safe travel.
Field identification & locations
Identify in the field by its opacity (unlike translucent agate) and its smooth, water-worn texture in riverbeds. Common in river gravels, volcanic regions, and arid deserts. Collectors look for consistent color and lack of heavy fracturing.
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