sedimentary
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque transparency, conchoidal fracture, and specific gravity around 2.58 to 2.91.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, opaque transparency, conchoidal fracture, and specific gravity around 2.58 to 2.91.
Formation & geological history
Forms from silica-rich solutions precipitating in sedimentary environments or hydrothermal veins, often associated with volcanic ash, over millions of years.
Uses & applications
Commonly used for ornamental carvings, polished cabochons in jewelry, spheres, and as a popular collectible specimen.
Geological facts
Naturally occurring heart-shaped stones like this are formed through differential weathering and water tumbling, where softer inclusions erode faster than the harder silica matrix, leaving distinct shapes.
Field identification & locations
Found worldwide in riverbeds, alluvial deposits, and ancient marine or volcanic formations. Collectors often look for unique shapes, patterns, and colors produced by mineral impurities like iron oxides.
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