Is a Stellation an extrusion?

Metal heated to be soft enough when pulled through hardened dies produces long prismatic sections on cooling, called extrusions. Used in metallurgy, plastics processing.

An extrusion is an igneous rock layer formed when lava flows onto Earth's surface and hardens. Extrusions are always younger than the rocks below it.

Typically it involves the melting of a plastic from pellet shape through an extruder. The plastic is melted to soften and then goes through a die to give it it's shape. It can be blown film, sheet...

intrusion - intrusion is when magma cools down inside Earth. extrusion - extrusion is when lava cools down on Earth.

Lava that hardens on the surface, and are younger than the rock layers below.