Agate geode weighing in at 1½ kilos, a hefty piece of rock which boasts fascinating banding and sparkling quartz crystals. The highly polished surface of this agate geode has a vitreous lustre but to be fully appreciated it will either need to be placed up at eye level or to be tilted back very slightly as the base is completely flat.
Being a relatively hard mineral which grades 7 on Mohs scale of mineral hardness makes agate ideal as a lapidary material and it's known to have been used for this purpose for thousands of years. Best known for its characteristic curves or angular bands, agate is a type of chalcedony which in turn is a cryptocrystalline variety of quartz.
Agate is usually translucent and exhibits more than one colour but due to these often being neutral colours like greys and whites, stones are often dyed in order for them to appear more attractive to the wider commercial market. That said, many agates can display spectacular colours which are caused by impurities such as iron, manganese, titanium, chromium and nickel.
Weight (grams) : 1460
Size (cms) : 15.6 x 8.7 x 8.9