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Identifying worked stone

Flint, marble, and hardstone.

Struck flint shows conchoidal (shell-like) fracture, a bulb of percussion, and ripples radiating from the strike point — the signatures of deliberate working. Frost-shattering and plough damage produce flat or irregular breaks without that bulb.

Marble and limestone sculpture weather differently; note tool marks (point, claw, rasp) and any surviving polish or paint. Traces of pigment in protected hollows are precious — record them and leave them alone.

Tools in tougher stones — granite, basalt, greenstone — were pecked and then ground smooth rather than flaked, so look for shallow peck-marks under the polish. Hardstone intaglios and cameos were carved with abrasives; look for the tell-tale rounded cuts of wheel engraving.

Name the stone cautiously. “Fine-grained dark stone” is honest; a firm geological identification usually needs a specialist, and the record should say which you have.

From the guide library inside Collectors Catalogues, a free app for cataloguing antiques and finds with honest, museum-grade records.

More on stone

Identifying struck flint — The signatures of knapping.

Identifying obsidian — Volcanic glass tools.

Identifying hand axes — The Palaeolithic multi-tool — pear-shaped, worked on both faces.

Identifying scrapers and blades — The everyday flint toolkit — and how retouch separates tool from waste.

Identifying microliths — Tiny geometric flints that armed Mesolithic arrows.

Identifying polished stone axes — Ground, smoothed, and traded across whole continents in the Neolithic.

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