fossil

Probable shell fragment (fossil or modern shell)

Calcium-carbonate shell, likely aragonite or calcite; exact organism cannot be determined from the image

AI-generated identification · may be incorrect

Cream-colored, matte, curved fragment with fine growth lines; shell hardness is typically about 3–4 Mohs. The visible surface and shape are consistent with shell material, though the image alone cannot establish whether it is fossilized.

Identified October 11, 2026More fossil →

Explore Probable shell fragment (fossil or modern shell) 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: Probable shell fragment (fossil or modern shell)
Scientific name: Calcium-carbonate shell, likely aragonite or calcite; exact organism cannot be determined from the image
Category: fossil
Identified: October 11, 2026
Method: Standard

AI Estimated Value

Usually under $1 for a common fragment; identifiable, well-preserved fossil shells may range from a few dollars to much more.

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

Shells form through biological deposition of calcium carbonate in marine or freshwater environments; fossilization occurs after burial and mineral alteration over geological time. The specimen’s age and setting are unknown.

Uses & applications

Shell fragments are collected as natural-history specimens and may be used in crafts or decoration; fossil shells are valued for education and collecting.

Geological facts

Many shells consist chiefly of aragonite or calcite, sometimes with layered microstructures that preserve growth patterns.

Field identification & locations

Look for concentric growth lines, layered edges, and a curved shell-like profile; confirm with close inspection because a small pale object is not diagnostic. Shell fossils occur in sedimentary rocks worldwide.