mineral

Quartz vein rock with iron-oxide staining

Massive and drusy quartz (SiO₂), with hematite/goethite and likely minor sulfides

AI-generated identification · may be incorrect

White to translucent, glassy quartz has hardness 7, vitreous luster, no cleavage, and conchoidal fracture; the dark red-brown coating is iron-oxide staining, possibly from hematite or goethite. The granular texture suggests a quartz vein or breccia rather than a single crystal.

Identified August 23, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich hydrothermal fluids filled fractures in older host rock, later oxidizing near the surface; the exact geological age cannot be determined from the photograph. Common in mineralized veins and weathered zones.

Uses & applications

Mostly a collectible or lapidary specimen; quartz may be used in glass, ceramics, electronics, and construction aggregate, but this irregular stained piece has little industrial value.

Geological facts

Quartz commonly grows in open fractures, producing interlocking grains, cavities, and drusy crystal coatings. Red coloration generally reflects oxidized iron rather than red quartz itself.

Field identification & locations

Look for hardness near 7, glassy fracture, and inability to scratch quartz with a steel knife; a streak or acid test can help distinguish associated minerals. Common worldwide, especially in hydrothermal vein districts.