This rock contains cassiterite.

There are a lot of pebbles at the bottom of this river.

Nepheline is a very important mineral in mineralogy.

She goes to school every day with her hair in bunches.

He is an excellent computer user.

Tsukiko is my best friend.

I ate the best sushi in Tsukiji.

The moonlight is illuminating the quiet night sea.

The electricity suddenly came on.

The moon at dawn is beautiful, isn't it?