mineral

Quartz (Agate/Jasper pebble)

Silicon dioxide (SiO2)

Hardness of 7 on the Mohs scale, yellowish-orange to brownish color, vitreous to waxy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65

Identified July 29, 2026More mineral →

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Physical properties

Hardness of 7 on the Mohs scale, yellowish-orange to brownish color, vitreous to waxy luster, trigonal crystal system, conchoidal fracture, specific gravity of 2.65

Formation & geological history

Forms from silica-rich solutions precipitating in cavities or voids within rocks over millions of years, often found in sedimentary or volcanic environments

Uses & applications

Used in lapidary arts, jewelry making, ornamental carvings, and as a mineral specimen for collectors

Geological facts

Quartz is one of the most abundant minerals on Earth's continental crust and exhibits piezoelectric properties, meaning it can generate an electrical charge when compressed

Field identification & locations

Can be identified in the field by its high hardness (scratches glass), lack of cleavage, and characteristic conchoidal fracture. Commonly found in riverbeds, beaches, and gravel deposits