Quartz Vein with Iron Staining

Physical Properties

Hardness: 7 (Mohs scale), Color: White to translucent with yellow/orange/brown staining, Luster: Vitreous to waxy, Crystal Structure: Trigonal (often massive in veins), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & Geological History

Formed from hydrothermal fluids rich in silica that were injected into fractures in older rock. The orange coloring is caused by the oxidation of iron-rich fluids or secondary minerals (like pyrite) that coated the quartz over time.

Uses & Applications

Common quartz is used for abrasive manufacturing, glass making, and as a semi-precious stone. Natural vein quartz specimens are popular among amateur rockhounds and collectors.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Specimens like this are often searched for by gold prospectors, as gold is frequently found within quartz veins.

Field Identification & Locations

Identify in the field by its hardness (it will scratch glass), lack of cleavage, and typical 'sugary' or glassy texture. Found globally in almost all geological environments by looking for white seams in darker country rock.

Identified on: 4/18/2026

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