Geology Superstore

Andesite

£2.25£3.50 ex VAT

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.

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    Delivery

    We ship to all 50 states, Washington DC.
    All orders are shipped with a UPS tracking number.
    Always free shipping for orders over US $200.
    During sale periods and promotions the delivery time may be longer than normal.

    Return

    Elessi will accept exchanges and returns of unworn and unwashed garments within 30 days of the date of purchase (14 days during the sales period), on presentation of the original till receipt at any store where the corresponding collection is available within the country of purchase.

    Your return will usually be processed within a week to a week and a half. We’ll send you a Return Notification email to notify you once the return has been completed.
    Please allow 1-3 business days for refunds to be received to the original form of payment once the return has been processed.

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    Email: contact@mydomain.com
    Phone: +1 (23) 456 789

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Andesite is an extrusive igneous rock formed when igneous material, magma, erupts on or very close to the earths surface. Chemically, andesite often has at or a little over 50% (but less than 63%) silica content, as such it has a slightly lighter density compared to mafic and ultra mafic rocks such as basalt as well as a lighter colouration. It will also often contain expected minerals expected from igneous rocks such as pyroxenes, usually augite crystals as well as plagioclase feldspar, both of these crystals can sometimes form large enough to be easily viewed by the naked eye and are known as phenocrysts. The name is derived from the type locality, the Andes mountains in South America, where it is found in abundance. These particular samples come from Barrowdale, Cumbria, UK and formed during the late Ordovician period and are part of the Barrowdale volcanic group. This group is believed to be a pre-caldera succession where abundance of basalt, andesite and dacite are found, the formation is thought top be roughly 2.6 km in thickness. An ideal rock for higher education use, though collectors may also consider these pieces to complete their collections, andesite is ideal to display the different main rocks found in the main groups of igneous rocks classified by chemical composition. They are available in three various sizes and 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.

Weight 130 g
Specimen Size

2" x 2", 3" x 2"

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