Quartz (Iron-stained)

Physical Properties

Hardness: 7 on Mohs scale; Color: Translucent to white with reddish-brown iron staining; Luster: Vitreous (glassy); Crystal Structure: Hexagonal (trigonal); Cleavage: Indistinct/Conchoidal fracture; SG: 2.65.

Formation & Geological History

Formed from cooling magma or precipitation from hydrothermal veins. It is found in all types of geological environments and can be found in rocks from nearly all geological ages.

Uses & Applications

Used in electronics (oscillators), glass manufacturing, abrasives, and as semi-precious gemstones in jewelry or for decorative collection.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear, but impurities like the iron oxides seen here create a variety of colors.

Field Identification & Locations

Identify by its ability to scratch glass, its lack of cleavage (it breaks in curved, shell-like patterns), and its glassy luster. Often found in creek beds or weathered out of veins.

Identified on: 4/24/2026

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