Image from Wikipedia. Arthurs Seat, Edinburgh.

Edinburgh – Volcanic heart of Scotland

Edinburgh – home of the Scottish Parliament, Military Tattoo, Princes Street and gardens, Scott memorial, Murrayfield, Valvona and Crolla’s food emporium, sundry pubs (!), volcanoes…Eh, volcanoes? Surprising as it may be to some people, Edinburgh plays host to a great variety of igneous rocks. The most obvious and in our case, the most interesting, are…

Picture of Mica from geology.about.com

An introduction to igneous rocks – Part 2

Micas Of which there are two predominant varieties in igneous rocks – Biotite and Muscovite – are a group of phyllosilicates; the name in allusion to the method and ease of perfect cleavage of the mineral into exceedingly thin laminae. They are characteristic of a wide range of rock type. Biotite, the mafic variety, is…

Picture from: mii.org Fedspar microcline.

An introduction to igneous rocks – Part 1

What is an igneous rock? It’s hard, may be pale or nearly black, but what’s in it? This entry is aimed as a brief introduction to igneous mineralogy/petrology to the ‘beginners’ and it may be useful to have available a mineralogy and/or petrology text, see the ‘Books’ below the title bar. An igneous rock is…