Wondrous Words Wednesday is a weekly meme where we share new (to us) and interesting (to us, again) words we encountered in our readings. See this week round-up at BermudaOnion’s blog!
My words for this week come from Pompeii by Robert Harris (my review), which I read as part of the geology/volcanology theme for One! Two! Theme! Challenge. Harris did not use many technical words, but he opens each chapter with a quote from an encyclopedic/technical book on the subject, and that’s where these words come from (original source at the bottom of each quote).
… with volatile-rich alkalic magma (55 percent SiO2 and almost 10 percent K2O) overlying slightly denser, more mafic magma.
(Peter Frances, Volcanoes: A Planetary Perspective)
Mafic: adj. Geology relating to or denoting a group of dark-coloured, mainly ferromagnesian minerals such as pyroxene and olivine. Often contrasted with felsic.
Convection carried incandescant [sic] gas and pumice clasts to a height of 28 km.
(Burkhard Mueller-Ullrich (editor), Dynamics of Volcanism)
Clast: n. Geology a constituent fragment of a clastic rock.
Clastic: adj. Geology denoting rocks composed of broken pieces of older rocks.
(All definitions are taken from the Concise Oxford English Dictionary © 2008 via WordReference.com unless otherwise stated.)