mineral
Quartz pebble with iron inclusion
Silicon Dioxide (SiO2)
Hardness: 7 on Mohs scale. Color: Translucent grayish-pink to reddish-brown due to iron oxide impurities. Luster: Vitreous to waxy. Crystal structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture).
- Hardness
- 7 on Mohs scale
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 on Mohs scale. Color: Translucent grayish-pink to reddish-brown due to iron oxide impurities. Luster: Vitreous to waxy. Crystal structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture).
Formation & geological history
Formed in hydrothermal veins, pegmatites, or igneous rocks, and later eroded and smoothed by water action into a rounded pebble.
Uses & applications
Commonly used for lapidary tumbling, decorative gravel, crystal healing collections, and educational specimens.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Iron inclusions often give clear quartz a smoky, rose, or reddish hue depending on oxidation state.
Field identification & locations
Identified by its ability to scratch glass (hardness 7), translucent body, lack of cleavage, and smooth water-worn surface. Found widely in riverbeds, gravel pits, and beaches worldwide.
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