Mr. Iwaishi is my best friend.

His hobby is collecting loose stones.

There are many beautiful stalactites in this cave.

The children were playing hopscotch in the park.

He admitted that it is difficult to execute the plan, saying 'it is easier said than done.'

Well then, I'm off.

We visited the ancient dolmen.

Amphibole, a type of mineral, is mainly found in igneous rocks.

Anatase is a type of titanium oxide, characterized by the shape of its crystals.

In mineralogy, antigorite is also called leaf serpentine.