GREEN AGATE CABOCHON STONE
This gemstone has been prized since antiquity and is a variety of Chalcedony, which in turn is a member of the Quartz family.
The gemstone was mentioned in the Bible as one of the “stones of fire”.Being a hard stone (a 7 on the Mohs scale), Agate is often used to make brooches and pins. Many Agates originate in cavities of molten rock, where gas bubbles trapped in solidifying lava are replaced with alkali and silica bearing solutions. Varieties of Agate include Onyx (Onyx is almost always a dyed Agate), Sardonyx, Ring Agate (encompassing bands of different colours), Moss Agate (with green banding), Blue Lace Agate, Turritella Agate, Snake Skin Agate, Rainbow Agate and Fire Agate.
It is believed by some to quench thirst, protect against viruses (including fever) and to cure insomnia. Among some tribes in Brazil, cut off from society, often without modern medicines Agate is used for a variety of ailments.
The gem can be found all over the world, but the main sources of gem-quality material come from Rio Grande do Sul in Brazil.