mineral
Quartz / Iron-Stained Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions/staining
AI-generated identification · may be incorrectHardness: 7 on Mohs scale; Color: Milky white to translucent with brown/yellow iron staining; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.
- Hardness
- 7 on Mohs scale
- Color
- Milky white to translucent with brown/yellow iron staining
- Luster
- Vitreous to greasy
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Physical properties
Hardness: 7 on Mohs scale; Color: Milky white to translucent with brown/yellow iron staining; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65.
Formation & geological history
Formed from hydrothermal veins or as a secondary mineral in igneous and metamorphic environments. This piece shows signs of alluvial weathering, indicating it was likely transported by water before being found.
Uses & applications
Common quartz is used in construction as aggregate, in glass manufacturing, and in electronics for its piezoelectric properties. This specific specimen serves as a collector's field find.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Iron-stained quartz like this is often referred to by gold prospectors as 'rusty quartz', which can sometimes indicate the presence of lode gold in the area.
Field identification & locations
Identify in the field by its inability to be scratched by a steel knife and its lack of cleavage. It is commonly found in riverbeds, mountains, and desert washes globally. Collectors should look for crystalline structures or associated minerals like pyrite.
