This mineral is called bieberite, and it is very rare in the world of mineralogy.

This rock is made of alunite.

Sudoite is a green mineral that is mainly found in Japan.

This beautiful malachite necklace is my favorite.

This beautiful prehnite is part of my mineral collection.

This stone building is an ancient ruin.

I was moved by his sincerity.

This contract includes a clause of exemption from responsibility.

His death was a deep regret for all of us.

He deeply lamented his failure.