mineral
Tumbled quartz pebble
Quartz, SiO₂; possibly iron-stained or included quartz
AI-generated identification · may be incorrectPolished, mottled cream, gray, and brown with a vitreous luster. Quartz has Mohs hardness 7, a hexagonal crystal structure, no cleavage, and specific gravity about 2.65.
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Physical properties
Polished, mottled cream, gray, and brown with a vitreous luster. Quartz has Mohs hardness 7, a hexagonal crystal structure, no cleavage, and specific gravity about 2.65.
Formation & geological history
Quartz commonly forms in igneous and metamorphic rocks and hydrothermal veins; the pebble was naturally rounded by erosion and then mechanically tumbled. Its age cannot be determined from the image.
Uses & applications
Used for jewelry, ornaments, and collecting; quartz is also important in glassmaking and electronics.
Geological facts
Quartz is one of Earth’s most abundant minerals and occurs in many colors due to impurities and inclusions.
Field identification & locations
Identify by its glassy luster, hardness, and lack of cleavage; quartz is widespread worldwide. The image shows a polished pebble, not enough detail to determine its exact variety or source.
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