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Basalt

Nepheline Syenite

£2.07 – £5.75 ex VAT

Amygdaloidal Lava With Chlorite Amygdales (Trap Rock) - Germany

£1.38 – £3.28 ex VAT

Basalt igneous rock specimens from, Ireland, which formed during the Tertiary period approximately 60 million years ago. A dense, fine crystalline, dark coloured rock which forms at extrusive igneous bodies and contains olivine alongside with various pyroxene minerals such as augite along with plagioclase as well. The samples are available in 3 sizes and come supplied in a white card specimen tray with a label. Being so common and an important igneous rock, it is suitable for educational use as they are one of the introductory and staple rocks that students are often shown when entering earth sciences.

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Basalt is a commonly occurring igneous rock which exhibits a fine crystalline texture and dark (often black or dark brown) colouration. Due to its chemistry, it is fairly dense and almost often forms as an extrusive rock, which is when molten magma erupts (extrudes) onto the earths surface. These particular specimens are from Ireland and are a part of the Antrim lava group. The (which also includes the famous Giants Causeway) and are dated to approximately 60 million years old to the Tertiary period. Their chemistry suggests that the rock is olivine basalt and comprises of plagioclase feldspar, olivine, augite, though other minor mineral may be present. Basalt, being so common, is a suitable beginner collectors sample 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. The specimens we supply of this rock are available in 3 sizes and come supplied in a white card tray with a small label.

Weight 130 g
Specimen Size

2" x 2", 3" x 2", 4" x 3"

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Basalt with Augite crystals

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Amygdaloidal basalt is an igneous rock which is extrusive in nature, these specimens formed over 60 million years ago during the Tertiary period and come from Ireland. They are part of the Antrim lava group and exhibit a dark colouration with occurrences of amygdales containing quartz and calcite crystals. As a basalt they are somewhat dense, but lighter than pure samples due to the cavities within them which formed as a result of gaseous activity during their ejection. Over time, hydrothermal fluids pass through the rock and minerals form within the cavities, which gives the usually dark coloured rock a speckled appearance. These samples are available in various sizes and are suitable for higher educational use to detail the subtle differences between similar igneous rocks, they come supplied in a card tray with an information label.

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