This area is rich in gabbro.

He is an expert in petrology and is in charge of geology lectures.

He attached a new bowl to the pipe.

He was observing birds using his new binoculars.

This dress is made of organdy.

I saw a magpie-goose for the first time in the park.

My new camera comes with a fisheye lens.

This beautiful apophyllite is part of my treasure collection.

This rock is a type called greenschist.

This greenschist is geologically very interesting.