sedimentary

Rounded limestone pebble

Limestone, predominantly calcite (CaCO₃)

AI-generated identification · may be incorrect

Pale beige, fine-grained, dull to subtly earthy luster, and smoothly rounded from abrasion. Calcite hardness is about Mohs 3; it commonly fizzes with dilute hydrochloric acid or strong vinegar, though the photo alone cannot confirm composition.

Identified August 29, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely a naturally weathered or water-worn sedimentary pebble formed from compacted carbonate sediment or accumulated shells. Limestone ranges from very young deposits to Paleozoic and older formations; its exact age and source cannot be determined visually.

Uses & applications

Used for crushed aggregate, cement, lime, building stone, and soil treatment; this small rounded piece has little practical or jewelry value.

Geological facts

The rounded shape indicates transport or prolonged abrasion, commonly in a stream, beach, or gravel deposit. The note “kac tl” is unclear and provides no reliable additional identification.

Field identification & locations

Look for uniform pale color, fine texture, and acid reaction; calcite may show weak cleavage and a white streak. Common worldwide, especially in marine sedimentary basins; avoid vinegar if preservation matters.