We decided to start the game on the defensive.

He hit his occipital bone hard.

Harry was searching for the Philosopher's Stone.

This rock is mainly composed of albite.

Olivine is a major component of the Earth's mantle.

This meteorite contains olivine.

This beautiful fluorite is part of my mineral collection.

This beautiful fluorite is part of my mineral collection.

There are many sweet flags blooming in this pond.

This rare stone is something I found in the mountains.