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Description: | Agate is the name used to describe banded varieties of chalcedony, which is a very fine-grained variety of the mineral quartz. This type of agate is called fortification agate, because the pattern in the banding resembles the plan of a fortified building. In Scotland, where this agate was found, agates occur in cavities (known as amygdales) in volcanic rocks. Agates are also found in the Cheviot Hills of Northumberland. | License: | http://www.imagine.org.uk/about/copyright/ | Rights holder: | Tyne & Wear Museums | Subjects: | rocks and minerals natural world | Source: | Tyne and Wear Imagine | Identifier: | http://www.imagine.org.uk/details/index.... | Go to resource |
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