Agate Nodules – Scotland
Agate nodules from Perthshire, Scotland, these excellent mineral specimens exhibit agate bands and quartz crystals of various colours within them, a form of chalcedony, they break as such with a conchoidal fracture and can have sharp edges. Available in various sizes and as matching pairs, the specimens are broken and rough without cutting or polishing. Excellent for collectors of Scottish minerals, they will make a fine addition to any collection.
Agates form in pockets known as nodules in igneous rocks of volcanic origin, these mineral specimens show the round nodule, almost pebble like, very well. Agate is a variety of chalcedony and forms when silca is deposited within pockets of gas in an igneous body, these deposits can form in layers, giving a banded appearance when the samples are split. Depending on the chemical nature, impurities and any intrusions in to the pocket, other minerals such as quarts crystals can also form inside as well. Thus creating beautiful, eye catching patterns and bands of alternating colours. These particular specimens come from Perthshire in Scotland and are fairly rare, they are available as single pieces or matching pairs and come supplied in a card tray with an information card.