AGATE

Agate is a variety of chalcedony, a microcrystalline form of quartz, with the chemical formula SiO₂. It is known for its banded patterns and wide range of colors, often forming in volcanic rocks. Agate has a hardness of 7 on the Mohs scale and a waxy to vitreous luster. It is primarily used in jewelry, decorative objects, and sometimes for healing and metaphysical purposes due to its beauty and durability.