£1.00 – £2.74
Basalt igneous rock specimens from Ballymena, County Antrim which formed during the Tertiary period approximately 60 million years ago. A dense, dark coloured rock which forms at extrusive igneous bodies which contains various pyroxene minerals such as augite along with plagioclase and quartz as well. The samples are available in 3 sizes and come supplied in a white card specimen tray with a label.
Basalt is a commonly occurring igneous rock with a fine crystal texture and dark colouration and is fairly dense. Basalt almost often forms as an extrusive rock when magma extrudes on the earths surface. It is composed primarily of pyroxene minerals such as augite crystals but minor occurrences of plagioclase feldspar are also present as well and silicate minerals such as olivine and quartz. These particular specimens come from Ballymena, County Antrim and formed in the Tertiary and form part of the Antrim lava group (which also includes the famous Giants Causeway) and are dated to approximately 60 million years old. The specimens are available in 3 sizes and come supplied in a white card specimen tray with an information label. Basalt is suitable for beginner collectors and an important rock for educational use due to how it forms as well as an important component in palaeomagnetism which allows geologists to observe and study the movement of the earths magnetic poles through out geological time.