The volcanic caramel of Nishinoshima

Some volcanoes deserve attention just because they are wonderful caramels that never stop tasting good. Nishinoshima is such a candy and I should really have written quite a lot more about her. In reality though it is hard to write about her since she does not have any monitoring equipment, nor does she have ready…

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…

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…