This ring is made of lazurite.

This volcanic rock contains a lot of olivine.

He suffered for a long time due to tabes dorsalis.

Analytical chemistry is a science for clarifying the components and structure of substances.

He is majoring in petrology at university.

He is an expert in tidology, studying the fluctuations of the sea's tides.

This fossil is made of carbon.

We conducted a meta-analysis on this issue.

Those guys are always late.

I practice the piano every day.