metamorphic

White quartz-rich rock, possibly marble or quartzite

Quartz (SiO₂)-rich metamorphic stone; exact identification is uncertain from the photograph

AI-generated identification · may be incorrect

White, opaque, dull to weakly sugary luster, with fine crystalline texture and irregular fracture. Quartz has Mohs hardness 7; marble is mainly calcite (Mohs 3), so a steel-scratch or acid test can distinguish them.

Identified September 12, 2026More metamorphic →

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Physical properties

Formation & geological history

Likely formed when quartz-rich sandstone recrystallized into quartzite, or when limestone metamorphosed into marble; ages vary widely depending on locality. The image alone cannot establish its geological age or precise composition.

Uses & applications

Quartzite is used as aggregate, building stone, and decorative stone; marble is used in sculpture, tiles, countertops, and monuments. Small pieces have modest educational or lapidary value.

Geological facts

Quartzite typically resists scratching by steel and does not fizz in dilute hydrochloric acid. Calcite-rich marble is easily scratched and fizzes strongly with acid, especially on a freshly broken surface.

Field identification & locations

Commonly found in metamorphic mountain belts worldwide. Inspect grain texture, test hardness, and use acid cautiously; the specimen may also be an unremarkable white quartz fragment.