The children were playing hopscotch in the park.

His hobby is collecting loose stones.

From a crystallography perspective, this peridot has very interesting characteristics.

This rock is made of alunite.

Vermiculite, in mineralogy, is a type of mineral and is used for various purposes due to its characteristics.

Sudoite is a green mineral that is mainly found in Japan.

This rock contains chlorite.

This beautiful serpentine necklace is a gift from my mother.

This beautiful prehnite is part of my mineral collection.

This stone building is an ancient ruin.