Geology Superstore


£2.25£6.00 ex VAT

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
Specimen Size

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

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