Definitions

1. adjective

Relating to or characteristic of the Perthite texture, a type of intergrowth of albite and orthoclase in feldspar.

“The perthitic texture is a common feature of many igneous rocks.”

2. noun

A perthitic texture or intergrowth of albite and orthoclase in feldspar.

“The geologist examined the perthitic structure under a microscope.”