metamorphic
Red jasper chips
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
AI-generated identification · may be incorrectTypically opaque brick-red to orange, with a dull to vitreous luster and no visible crystals; Mohs hardness about 6.5–7, massive texture, conchoidal fracture, and specific gravity around 2.5–2.7.
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Physical properties
Typically opaque brick-red to orange, with a dull to vitreous luster and no visible crystals; Mohs hardness about 6.5–7, massive texture, conchoidal fracture, and specific gravity around 2.5–2.7.
Formation & geological history
Jasper forms when silica-rich fluids cement or replace sediments and volcanic material, with iron oxides producing the red color. It occurs in many ages, commonly in Precambrian iron-formations, volcanic terrains, and silicified sedimentary deposits.
Uses & applications
Used for beads, cabochons, carvings, polished stone, lapidary chips, and ornamental objects; occasionally used as aggregate or decorative facing stone.
Geological facts
The specimen appears tumbled or broken into small lapidary pieces rather than being a single natural outcrop sample. Color intensity depends on hematite or limonite impurities, while darker areas may contain manganese or other minerals.
Field identification & locations
Identify jasper by its opaque red color, hardness, lack of cleavage, and inability to scratch with a steel knife easily; it should not fizz in dilute acid. Common sources include India, Brazil, Madagascar, Australia, South Africa, and the western United States.
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