Agate
Natural stone
A banded chalcedony, a fine-grained quartz, formed in cavities in volcanic rock. Tough and easy to cut, it is a classic for cabochons and slabs; much agate on the market is dyed.
Hardness (Mohs): 6.5–7
Natural stone
A banded chalcedony, a fine-grained quartz, formed in cavities in volcanic rock. Tough and easy to cut, it is a classic for cabochons and slabs; much agate on the market is dyed.
Hardness (Mohs): 6.5–7