mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: Creamy white to pale yellow/orange due to iron staining; Luster: Vitreous to waxy; Crystal structure: Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: Creamy white to pale yellow/orange due to iron staining
Luster: Vitreous to waxy

Identified June 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids in veins or as a primary constituent of igneous and metamorphic rocks. This specific specimen shows signs of river or coastal erosion (rounding).

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as decorative gravel or landscaping stone. Higher quality specimens are used in jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear; the yellow/brownish tint here comes from microscopic iron oxide inclusions or surface staining.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. This rounded cobble is common in riverbeds and glacial deposits globally, such as the Northeast United States or UK coastlines.