conchoidal

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$Sample of an untreated red flint with a conchoidal fracture Royalty Free Stock Photo$

$Oregon Opal. White, Translucent, conchoidal fractures. Black Background. Royalty Free Stock Photo$

$Oregon Opal. Brown, red, white and translucent. Conchoidal fractures. Black background. Royalty Free Stock Photo$

This attractive image shows a conchoidal surface that gently curves, vintage line drawing or engraving illustration