mineral
Quartz pebble with iron stains
Macrocrystalline Quartz (SiO2)
Hardness: 7 Mohs; Color: Translucent white to tan with reddish-brown iron oxide surfaces; Luster: Vitreous to waxy; Structure: Hexagonal; Cleavage: None (conchoidal fracture).
- Hardness
- 7 Mohs
- Luster
- Vitreous to waxy
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Physical properties
Hardness: 7 Mohs; Color: Translucent white to tan with reddish-brown iron oxide surfaces; Luster: Vitreous to waxy; Structure: Hexagonal; Cleavage: None (conchoidal fracture).
Formation & geological history
Formed via hydrothermal activity or igneous crystallization. This specific piece is a water-rounded pebble likely weathered from a vein and tumbled in a river or coastal environment.
Uses & applications
Commonly used in landscaping, as a gemstone (if high quality), or industrial glass and electronics manufacturing (silica source).
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. The reddish tint on this specimen is caused by thin films or inclusions of iron oxides like hematite or limonite.
Field identification & locations
Identified by its ability to scratch glass and lack of cleavage. Common in riverbeds and gravel pits worldwide. Collectors look for clearer terminations or unique inclusions.
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