mineral
Tumbled Quartz
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, clear to translucent with brownish-red iron oxide staining, vitreous to greasy luster, trigonal crystal structure internally, conchoidal fracture with no true cleavage, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, clear to translucent with brownish-red iron oxide staining, vitreous to greasy luster, trigonal crystal structure internally, conchoidal fracture with no true cleavage, specific gravity of 2.65.
Formation & geological history
Formed in a wide variety of geological environments, frequently in hydrothermal veins, pegmatites, and as detrital grains in sedimentary rocks. This specific specimen has been water-worn or tumbled to a smooth, rounded pebble shape.
Uses & applications
Used in lapidary arts, jewelry, as a tumbling stone for collection and metaphysical purposes, and in various industrial applications such as glassmaking and electronics.
Geological facts
Quartz is one of the most abundant and recognizable minerals on Earth's continental crust. Iron oxide inclusions are responsible for the warm reddish-orange staining visible on the surface.
Field identification & locations
Easily identified by its hardness (scratches glass), lack of cleavage, and conchoidal fracture. Found worldwide in riverbeds, beaches, and mineral deposits.
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Arenite (SiO2 based)
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Limonite / Goethite (Iron Ore Mineral nodule)
FeO(OH)·nH2O / FeO(OH)
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Septarian Pebble
Septarian nodule / Concretion
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Potassium Feldspar (Orthoclase)
Orthoclase (KAlSi3O8)
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Schist
Schist
Metamorphic