mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Tan to orange-pink (due to iron oxide staining); Luster: Vitreous to waxy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); SG: 2.65.

Hardness: 7 (Mohs scale)
Color: Tan to orange-pink (due to iron oxide staining)
Luster: Vitreous to waxy

Identified April 3, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: Tan to orange-pink (due to iron oxide staining); Luster: Vitreous to waxy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); SG: 2.65.

Formation & geological history

Formed in hydrothermal veins or igneous pegmatites. This specific specimen appears to be a water-worn, tumbled pebble likely eroded from a vein and polished by river or coastal action over thousands of years.

Uses & applications

Used widely in glassmaking, abrasives, and as semi-precious gemstones. In this tumbled form, it is primarily used for landscaping, decoration, or lapidary practice.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear, but subtle impurities create a massive range of colors (Amethyst, Citrine, Rose Quartz).

Field identification & locations

Identify in the field by its inability to be scratched by a steel knife and its lack of cleavage. It is extremely common in riverbeds, mountains, and beaches worldwide.