mineral

Small white mineral fragment

Likely quartz (SiO₂), possibly calcite (CaCO₃)

AI-generated identification · may be incorrect

White, translucent-to-opaque, uneven granular surface with vitreous to dull luster; apparent hardness cannot be confirmed from the image. Quartz has Mohs hardness 7 and no cleavage; calcite is Mohs 3 and has prominent rhombohedral cleavage.

Identified August 20, 2026More mineral →

Explore Small white mineral 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

Most likely a broken crystal or vein fragment from hydrothermal quartz/calcite mineralization in host rock; age depends on its source deposit and cannot be determined visually.

Uses & applications

Quartz is used in glass, electronics, abrasives, and collectors’ specimens; calcite is used in cement, lime, agricultural products, and decorative stone.

Geological facts

The key distinction is hardness: quartz will scratch ordinary glass, whereas calcite is readily scratched by a steel knife and may effervesce with dilute hydrochloric acid.

Field identification & locations

Commonly found in veins, cavities, and sedimentary or metamorphic rocks worldwide. Inspect crystal faces, cleavage, transparency, and matrix; perform hardness and acid tests only when appropriate and safe.