fossil

Fossil coral pebble and banded stone

Likely fossilized tabulate or rugose coral (left); right specimen may be silicified coral or weathered limestone

AI-generated identification · may be incorrect

The right rounded specimen shows a dense honeycomb of polygonal corallite-like cells, cream to brown, with dull earthy luster and approximate Mohs hardness 3–6 depending on replacement mineral. The left pebble has dark gray-blue curved banding and a waxy luster, possibly agate or chert;…

Identified August 28, 2026More fossil →

Explore Fossil coral pebble and banded stone in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

At a glance

Common name: Fossil coral pebble and banded stone
Scientific name: Likely fossilized tabulate or rugose coral (left); right specimen may be silicified coral or weathered limestone
Category: fossil
Identified: August 28, 2026
Method: Standard

AI Estimated Value

About $2–$15 each as common beach or field specimens; attractive polished or well-preserved fossil coral may sell for $20–$100+.

Not an official valuation

AI estimate for general interest only — not an appraisal. Actual value depends on condition, provenance, and market demand. Verify with a professional before buying, selling, or insuring.

This identification was generated by AI and may contain errors. Verify important details before relying on them — and never use an AI result to judge whether a specimen is safe to handle. Read the full disclaimer

Physical properties

Formation & geological history

The apparent coral formed in a Paleozoic–Mesozoic shallow marine reef, later lithified and commonly replaced by silica or calcite; its precise age cannot be determined from the photograph. Weathering and abrasion produced the rounded pebble shape.

Uses & applications

Collected as fossil material, lapidary rough, or decorative pebbles; silicified coral can be polished for cabochons and ornaments, while limestone coral is mainly ornamental.

Geological facts

Fossil coral is identified by repeated corallite walls or septa rather than random mineral veining. Silicification can preserve microscopic coral architecture while making the specimen harder and more durable.

Field identification & locations

Inspect the right stone with a hand lens for consistent, repeated cell boundaries; dilute acid may fizz on calcitic coral but not silica-replaced coral. Fossil corals occur widely in Paleozoic and Mesozoic marine limestones worldwide.