mineral
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂)
AI-generated identification · may be incorrectHardness 7 Mohs; opaque to translucent creamy-white color, vitreous to waxy luster, and conchoidal fracture. It has a trigonal crystal structure but no visible cleavage; specific gravity is about 2.65.
Identified More mineral →
Explore Tumbled milky quartz pebble in the encyclopedia →Identify your own rocks.
Get a report just like this from any photo, free.
Physical properties
Hardness 7 Mohs; opaque to translucent creamy-white color, vitreous to waxy luster, and conchoidal fracture. It has a trigonal crystal structure but no visible cleavage; specific gravity is about 2.65.
Formation & geological history
Likely natural quartz rounded by water or deliberately tumbled and polished; its milky appearance comes from microscopic fluid inclusions or fractures. Quartz formed in igneous, hydrothermal, and metamorphic environments across many geological ages.
Uses & applications
Used for decorative stones, cabochons, carvings, countertops, glass, and electronics; this small specimen has modest collector value.
Geological facts
Quartz is one of Earth’s most abundant minerals and is the main component of granite, sandstone, and many veins. The smooth shape and uniform polish indicate human tumbling rather than a crystal face.
Field identification & locations
Identify it by its hardness, pale color, glassy luster, lack of cleavage, and inability to scratch it with a steel knife (though quartz scratches glass). Common sources include quartz veins, river gravels, Brazil, Madagascar, and the United States.
