mineral

Polished brecciated quartz specimen

Quartz (SiO₂), likely with iron-oxide staining and minor associated minerals

AI-generated identification · may be incorrect

White to cream, translucent crystalline fragments in a polished rectangular piece, with tan-brown iron staining and druzy-like sparkling surfaces. Quartz has Mohs hardness 7, vitreous luster, hexagonal crystal structure, indistinct cleavage, and specific gravity about 2.65.

Identified August 14, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed when silica-rich fluids deposited quartz in fractures or cavities, followed by brecciation and cementation; iron-bearing fluids produced the brown staining. The exact geological age and locality cannot be determined from the image.

Uses & applications

Used primarily as a decorative, lapidary, or display specimen; quartz is also important in glass, electronics, abrasives, and engineered stone. This piece has modest collector value unless its locality or unusual mineral associations are documented.

Geological facts

The angular fragments and contrasting cement suggest brecciation rather than a uniformly crystallized quartz vein. Surface polish can obscure natural crystal faces and make precise identification of associated minerals difficult.

Field identification & locations

Look for quartz’s glassy luster, hardness, translucency, and inability to scratch it with a steel knife; acid should not noticeably react. Common settings include hydrothermal veins, cavities, and silicified breccias worldwide.