mineral
Tumbled red/purple quartz, possibly garnet
Likely quartz (SiO₂), potentially amethyst or iron-stained quartz; identification is uncertain from the blurry image
AI-generated identification · may be incorrectSmall rounded translucent reddish-purple pebble with vitreous luster and no visible cleavage; quartz hardness is Mohs 7, while garnet is 6.5–7.5. The dark color may result from iron impurities or lighting.
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Physical properties
Small rounded translucent reddish-purple pebble with vitreous luster and no visible cleavage; quartz hardness is Mohs 7, while garnet is 6.5–7.5. The dark color may result from iron impurities or lighting.
Formation & geological history
Quartz forms in hydrothermal veins and cavities; amethyst develops purple coloration from iron and irradiation. Garnet forms in metamorphic rocks, commonly during regional metamorphism.
Uses & applications
Tumbled quartz is used for decoration, lapidary work, and inexpensive jewelry; gem-quality amethyst and garnet are cut as gemstones. Common specimens generally have modest value.
Geological facts
The visible form appears human-tumbled or polished rather than naturally weathered. A streak test, hardness test, and inspection for crystal faces would help distinguish quartz from garnet.
Field identification & locations
Common sources include Brazil, Uruguay, Madagascar, India, and the United States. Quartz scratches glass and has no cleavage; garnet commonly shows rounded dodecahedral crystals and is typically less transparent.
