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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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Amygdaloidal basalt is a variety of extrusive igneous rock which has a fine crystalline texture to it and an often black or very dark brown colouration and sometimes with a hint of green. Like regular basalt, it forms by rapid cooling of lava which often has a low viscosity (runny/fluid). They are normally basic in composition and rich in dense, iron and pyroxene minerals but is often low in silica minerals such as quartz, giving the rock a dark colour and density. However, in some gaseous, violent eruptions, dissolved gases in the magma can form bubbles and as the pressure is released upon eruption, the bubbles can become trapped within the solidified rock making it partially porous. Overtime, water or other liquid solutions produced by volcanic activity can percolate (pass) through the rock due to the porosity and result in the formation of crystals in said pores (cavities). These minerals are often hydrothermal in nature and include quartz, calcite and various species of zeolites, these infilled cavities are known as amygdales, hence the name, amygdaloidal basalt and give the often dark rock a white speckled appearance. These specimens come from Ireland, which formed during the Tertiary period approximately 60 million years ago and formed part of the Antrim Lava group which also includes the famous Giant’s Causeway. They are suitable for collectors and higher level education to show the fact that not all rocks of a similar composition will look the same and will vary depending on type of eruption, chemistry and other variable factors. The samples are available in 3 sizes and come supplied in a card tray with an information label.
Weight | 130 g |
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Specimen Size | 2" x 2", 3" x 2", 4" x 3" |
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Amygdaloidal Basalt is a variety of basalt from the Isle of Skye, specimens are supplied in a polythene bag in lots of 1 kg with a label.
45 in stock
Amygdaloidal basalt thin section slide exhibiting amygdaloids of varying sizes within a fine grained basaltic ground mass. This particular material was collected from the Isle of Skye, Scotland. Each section is made to 30 microns thickness and the glass is 46 x 27 mm in size with a cover slip. Supplied in a protective card sleeve with a label, ideal for microscopy.
5 in stock
Igneous Basalt of Tertiary age from Northern Ireland. Specimens are typical black in colour and has a fine grained texture. Specimens are supplied in polythene bags in lots of 1 kg and are come with an information label.
73 in stock
A field guide containing various pages which are based on the munsell colour system to aid in the identification of rocks whilst working in the field.
Out of stock
Specimens of clear quartz crystal beds within basalt from Barras, Kincardineshire, Scotland. Pieces are supplied in a card tray with an information label. These are ideal samples for collectors of British minerals and rocks.
Out of stock
Biotite muscovite granite specimens from St. Austell in Cornwall, UK of Permian age is a coarse grained igneous rock composed of quartz, plagioclase feldspar, biotite and muscovite. The rock is part of the St. Austell pluton which formed 280 million years ago. An off white colour with gold and black flecks of micas, the rock has a unique chemistry and resulted in the rich mineralisation of ores in the area. The samples are suitable for collectors and educational use to show granite variants, available in three sizes. Each piece will come supplied in a card tray with an information label.
We also supply Biotite Muscovite Granite thin sections for microscope study which are available to buy HERE.
75 in stock
Granodiorite specimens from Cumbria, UK. These rocks originate from the Ordovician era, dating back roughly 443 to 448 million years. This Granodiorite, derived from Eskdale granite outcrops, exhibit a coarse-grained texture and represents a blend of granite and diorite characteristics.. While sharing mineral components like quartz, feldspar, and mica with granites, its distinctiveness lies in the elevated levels of plagioclase and mafic minerals like biotite, hornblende, and augite. Notably, this specific Granodiorite variety boasts a significant biotite content. Available in three different sizes, these specimens come supplied in a white card tray with information label.
We also supply Granodiorite thin sections for microscope study which are available to buy HERE.
Trachyte, a common igneous rock composed of various minerals including quartz, feldpsars, micas and olivine, rock specimens come from East Lothian, Scotland and are available in optional sizes, supplied in a card tray with a label.
The Estwing E6-24PC geological hammer, also known as the ‘Big Blue’ hammer is a pointed tip strike tool which features a wider flat face, delivering more force per strike, making breaking and crushing of rock much easier. It also features a pointed tip, suitable for picking and prying material as well as allowing careful extraction of fossils or crystals from matrix. The hammer is made from a single piece of drop forged American steel and utilises a anti shock vinyl handle for comfort.
Technical Specification:
1 in stock
Andesite igneous rock specimens of late Ordovician age which form part of the Barrowdale volcanic group. The rocks come from Cumbria, UK and have a dark colouration with a blue tint and may contain augite crystals. The rocks are intermediate in chemistry and suitable for higher level education to explain the difference in various igneous groups. Samples are available in 3 sizes and will come supplied in a card tray with an information label.
We also supply Andesite thin sections for microscope study which are available to buy HERE.
Larvikite is an igneous plutonic rock and variant of monzonite from Larvik, Norway, due to its chemistry, it is composed mainly of orthoclase, albite and anorthite along with plagioclase which gives the rock a blue to silver shimmering effect. The igneous pluton formed during the Permian period, 292 – 298 million years ago during the the Variscan orogeny. A beautiful rock to observe due to its coarse crystalline texture and schiller effect, the samples are ideal for general interest, collectors and educational use with specimens being available in three sizes and come supplied in a card tray with an information label.
We also supply Syenite thin sections for microscope study which are available to buy HERE.
138 in stock
Accretionary lapilli tuff is an igneous pyroclastic rock, these samples come from Longsleddle, Cumbria in the UK and forms when hot ash and debris is ejected from as volcano. Some of this material is held together by moisture and once heavy enough, falls into the ash below forming small ‘spots’ within the material, creating a speckled rock. The samples are suitable both for young and serious collectors as well as educational use and are supplied in various sizes with a card tray and label.
65 in stock
Quartz monzonite igneous rock specimen from Ratagan, Scotland. Associated to granites, yet containing only 5% to 20% quartz, making it a monzonite, these intrusive felsice rocks are igneous in origin and are available in different sizes, supplied in a white card tray with a label.
28 in stock
Biotite granite igneous rock specimens from Ballachulish, Scotland, UK. Composed of the felsic minerals quartz and feldspar, with occurrences of biotite crystals. The rock has an overall white appearance due to its felsic chemistry but the black biotite mica offers a striking contrast in colours. The samples are ideal for both collectors due to the attractive nature and for college to university level education to describe the variations in granite which one may find. The samples are available in three sizes and supplied in a card tray with an information label.
64 in stock
Specimens of Basalt, collected from Northern Ireland. Basalt is a common, extrusive igneous rock, that forms when magma erupts and cools quickly on the Earth’s surface. These specimens are part of the Antrim lava group and date to the Tertiary period, around 60 million years ago. This is the same as the Basalt that makes up the famous Giant’s Causeway. The chemistry of these specimens suggests that the rock is olivine basalt, and comprises plagioclase feldspar, olivine and augite. These specimens are available in multiple sizes and come in a white card tray with an information label.
We also supply Basalt thin sections for microscope study which are available to buy HERE.
10 in stock
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