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Definitions from the Web

Pseudo morph

Pseudomorph refers to a mineral or substance that retains the outward shape or form of a different mineral or substance, despite undergoing a chemical transformation. It occurs when one mineral replaces another, but the crystal structure of the original mineral remains intact.

- This sample of amethyst shows a pseudomorph of quartz after calcite, where the original calcite crystals have been replaced by quartz, maintaining the original shape.

- The pseudomorph of pyrite after marcasite is commonly found in certain geological formations, exhibiting the original cubic shape of marcasite but composed of pyrite instead.

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