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Agglomerate igneous rock specimens from Scotland, UK. A coarse grained, hard blocky rock exhibiting a conglomeration of various minerals and igneous material of volcanic origin. These samples formed part of the Glen Coe caldera and are apart of the upper streaky andesite unit, the exhibit poor sorting and orientation of material which indicates a somewhat violent origin but this can vary from agglomerates by location and is mainly down to the chemistry of the igneous material. The samples are available in 3 sizes and come supplied in a card tray with a label, they are suitable for educational use to show the different types of volcanic rocks produced as well as those interested in collecting rock samples.
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Agglomerate is a volcanic rock, sometimes referred to as a pyroclastic rock and is composed of various large sized pieces of volcanic material which can vary depending on the type of volcanic chemistry which produced them. The material is classified as such, when the composition of the rock is at least 75% volcanic bombs, these inclusions will often have a ropy, ragged or ovoid shape as inclusions in the main body of the material. The rock, as expected, is often found in and around volcanic vents and appear to look like breccias of volcanic origin, due to the processes in which they form, agglomerates usually exhibit poor sorting of clasts, with sizes and orientations being random, they will also contain various pieces of igneous rocks embedded within an ash or tuff matrix. As such, they are best described as having a coarse texture and are often fairly hard rocks. These particular specimens belong to the Upper streaky andesite series and come from Scotland, UK and are suitable for collectors or higher level education use to further explain various forms of volcanic activity and material. The samples are available in various sizes, each rock specimen will 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" |
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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.
67 in 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.
77 in stock
German Eclogite specimens from Weissenstein, Bavaria. Eclogite is a metamorphic rock, featuring red garnets within a matrix of sodium rich plagioclase called omphacite. These samples are perfect for both collectors and for educational use. They come supplied in a white card tray with an information label. Limited stock available.
Streak plates in a black colour made form porcelain, tough and ideal for performing streak tests, to asses minerals or mineral content of a rock sample, each plate is 45 x 45 mm in size and has a fine texture surface. Excellent for field geologists and earth science students.
Specimens of red soapstone from the Shetland Islands, Scotland, UK. Supplied in a white card tray with an information label, these peculiar samples are ideal for any collector of British material.
Augite andesite igneous rock specimens from Thirlmere, Cumbria, UK which are of late Ordovician age which form part of the Barrowdale volcanic group. The samples are of intermediate composition and contain phenocrysts of the pyroxene mineral, augite, giving the normally dark blue rock a black speckled appearance. The samples are available in 3 sizes and come supplied in a card tray with a label.
100 in stock
The sedimentary rock texture card is made for earth science students, it displays numerous bites of information on how to determine an sedimentary rock specimen found in the field such as grain size, texture and an indication to the energy required to form the rock. The cards have been laminated, making them waterproof, small, the size of a bank card and an excellent to hand guide for students, amateurs and professionals.
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.
2 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.
70 in stock
Lewisian gneiss metamorphic rock samples exhibiting asymmetrical plunging folds, ideal for educational use, the specimens come from Scotland, UK and are, some 3.0–1.7 billion years old, dating back to the Precambrian period. The rock is made of feldspar, quartz and biotite mica minerals which show banding and have folded in an asymmetrical fashion and plunged. Limited quantity available.
2 in stock
Specimens of agate within basalt from Barras, Kincardineshire, Scotland. These samples of agate have a red to white colouration and have filled the cavities of basalt. Specimens are supplied in a white card tray with an information label.
2 in stock
Ignimbirte welded tuff is a pyroclastic rock of any origin formed through volcanic processes, the rock appears to show streaks of welded material on some surfaces and appears to be rhyolitic on the inside. Specimens come from Cumbria and are available in various sizes.
78 in stock
The igneous rock texture card is made for earth science students, it displays numerous bites of information on how to determine an igneous specimen found in the field such as grain size, silica and mineral content and other observable features. The cards have been laminated, making them waterproof, small, the size of a bank card and an excellent to hand guide for students, amateurs and professionals.
146 in stock
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