Harry was searching for the Philosopher's Stone.

Her ring was adorned with beautiful turquoise.

Aragonite is a type of calcium carbonate, and its crystal structure is distinctive.

Aragonite is a type of calcium carbonate, and its crystal structure is distinctive.

This beautiful garnet is part of my mineral collection.

This rock contains cassiterite.

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

Nepheline is a very important mineral in mineralogy.

Old Church Slavonic is the first language written by the Slavs.

Old Church Slavonic is the oldest recorded language of the Slavic group.