mineral

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly a fragment of quartzite or silica-rich slag

AI-generated identification · may be incorrect

Gray-white, translucent to opaque, with a glassy to dull luster and irregular fracture; quartz hardness is 7 Mohs, lacks cleavage, and has a specific gravity near 2.65. The image is insufficient to confirm crystal shape or distinguish natural quartz from glassy industrial material.

Identified August 25, 2026More mineral →

Explore Likely quartz-rich rock fragment in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

If natural, quartz formed from silica-rich hydrothermal fluids or as grains recrystallized in quartzite; quartz is common from Precambrian to modern geological settings. Its jagged, granular appearance could also represent processed silica or furnace slag, which is not a natural rock.

Uses & applications

Quartz is used in glass, electronics, ceramics, abrasives, and engineered stone; attractive transparent crystals are collected or cut as gemstones. Quartzite is used for construction aggregate, countertops, and dimension stone.

Geological facts

Quartz commonly shows conchoidal fracture and does not react with dilute hydrochloric acid. A steel file should not scratch it, while quartz should scratch ordinary window glass.

Field identification & locations

Common locations include veins, pegmatites, sandstone, and quartzite terrains worldwide; inspect for crystal faces, natural grain boundaries, bubbles, or flow texture to separate quartz from glass/slag. The specimen cannot be identified confidently from one photograph.