He tends to hold onto past failures.

Life in the Stone Age was greatly different from today.

He was diagnosed with tabes dorsalis.

This rock contains sanidine.

This is a beautiful sample of rosasite.

This beautiful stone is called chrysocolla, characterized by its vibrant turquoise color.

Last night, a mudslide occurred, and our town suffered significant damage.

Her necklace had a beautiful cat's eye stone.

Complex analysis is a branch of mathematics that studies functions of complex numbers.

He is an expert in harmonic analysis.