Ao is my best friend, always a bright and energetic woman.

The green tomatoes are not yet edible.

This blue is a rare shade, isn't it?

This greenschist is geologically very interesting.

This area is rich in green tuff.

His new car is yellow-green.

This rock contains a lot of silica.

This fossil has been silicified over millions of years.

This rock was formed through the process of silicification.

This mountain is mainly composed of quartzite.