Orthoclase is a type of mineral, mainly found in granite.

There are more than a billion quintillion stars in this galaxy.

The cathode of this battery is made of copper.

These two variables are in a proportional relationship.

These two variables vary directly.

Masashi is my best friend.

He is studying the Christian canon.

Masanori is my best friend.

Kazumasa is my best friend.

Masami is my best friend.