mineral
Quartz Pebble (with Hematite Inclusions)
Silicon Dioxide (SiO2)
Mohs hardness of 7, vitreous to waxy luster, light greyish-translucent body with reddish-orange iron oxide (hematite) staining, trigonal crystal system in microcrystalline forms, conchoidal fracture, no distinct cleavage.
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Physical properties
Mohs hardness of 7, vitreous to waxy luster, light greyish-translucent body with reddish-orange iron oxide (hematite) staining, trigonal crystal system in microcrystalline forms, conchoidal fracture, no distinct cleavage.
Formation & geological history
Formed in hydrothermal veins or igneous pegmatites, subsequently eroded, rounded by river or wave action, and stained by groundwater containing iron minerals like hematite.
Uses & applications
Commonly collected as river rocks, used in lapidary work, decorative landscaping, and as an industrial source of silica in manufacturing.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Iron oxide impurities often give quartz a reddish, brownish, or yellow tint, creating varieties like carnelian or jasper when fully colored.
Field identification & locations
Identified by its hard, vitreous surface that easily scratches glass and steel, rounded stream-worn texture, and reddish iron staining. Very common worldwide in riverbeds, beaches, and gravel pits.
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