What is icelandite and Iceland spar?
Kristján Heiðar Jóhannsson
AnswerIcelandite is a type of rock, iron-rich andesite. The name was coined by the British geologist Ian Carmichael (who later became professor at Berkeley in California) while working around 1960 on his PhD thesis at a Tertiary volcano near the parsonage Thingmuli in E-Iceland. For continental cogenetic series of volcanic rocks it is generally the case that the concentration of iron decreases with increasing silica content, but at Thingmuli the opposite was true, leading Carmichael to the conclusion that the iron-rich intermediate rock deserved its own name, icelandite.
Um þessa spurningu
Sigurður Steinþórsson. „What is icelandite and Iceland spar?“. The Icelandic Web of Science 6.3.2005. http://why.is/svar.php?id=4807. (Skoðað 23.3.2017).
Sigurður Steinþórssonprófessor emeritus