Lapis lazuli

English
Chalcedony

Origin
Brazil

Introduction
The chemical composition of chalcedony is silicon dioxide (SiO₂). It is a microcrystalline quartz, a silicate mineral characterized by its dense structure and hardness. It is also known as "white agate."

In history, it was often used by ancient civilizations as amulets, seals, and ornaments. For example, during their ancient Egyptian and Roman periods, it was used to carve Buddha statues and deity images, symbolizing purity and protection.