mineral

Small white crystalline mineral fragment

Indeterminate; possibly calcite or quartz

AI-generated identification · may be incorrect

White to off-white, irregular granular texture with a vitreous-to-pearly luster; hardness cannot be determined reliably from the image. Visible interlocking crystals suggest a crystalline mineral aggregate rather than a fine-grained rock.

Identified September 20, 2026More mineral →

Explore Small white crystalline 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

Likely a natural mineral fragment, though the photograph does not establish its geological setting, age, or formation process. Calcite commonly forms in sedimentary veins and cavities, while quartz forms in igneous and hydrothermal environments.

Uses & applications

Unremarkable fragments of this size generally have no commercial use or significant jewelry value; calcite and quartz are industrially important in larger quantities.

Geological facts

Calcite effervesces in dilute hydrochloric acid, whereas quartz does not. A scratch test can distinguish them: quartz is harder than steel, while calcite is easily scratched by a steel knife.

Field identification & locations

Field identification requires hardness, cleavage, and acid testing: calcite has three-way rhombohedral cleavage; quartz lacks cleavage and commonly shows conchoidal fracture. Common sources include veins, limestone cavities, and granitic or hydrothermal rocks.