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Author Nawaz, Rab ♦ Ryback, George
Source CiteSeerX
Content type Text
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Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Ferri-ferro Hornblende ♦ Northern Ireland ♦ Amphibole Specie ♦ Richard Kir-wan ♦ Variolitic Andesite Dyke ♦ Likely Dunmore Head ♦ Type Locality ♦ Irish Chemist ♦ Fibre Divergent ♦ Fibrous Texture ♦ Chemical Data ♦ Original Analysis ♦ Mourne Dyke Swarm ♦ Basaltic Rock ♦ Patrick Doran ♦ Irish Mineral Collector ♦ Dark Olive Green ♦ Natural Philosopher ♦ X-ray Powder ♦ Ne Coast
Abstract X-ray powder, optical, infrared, and chemical data suggest that kirwanite is an amphibole of compo-sition (Na,K)o.lOCa1.80(Fez+,MnhlOMgo.79Fe1~4Alo.78Si7180zz(OHh and thus corresponds to ferri-ferro-hornblende (Leake, 1978). The type locality, originally given as the NE coast of Ireland, is most likely Dunmore Head, Co. Down. Kirwanite occurs in the groundmass and the vesicles of variolitic andesite dykes of the Mourne dyke swarm. Thomson's original analysis of kirwanite was probably made on a mixture and the name should not be used for an amphibole species. K IRWANITE was first named by T. Thomson (Bryce, 1831; Thomson, 1836)) after Richard Kir-wan (1733-1812), the Irish chemist and natural philosopher, on the basis of an analysis by R. D. Thomson of specimens provided by Patrick Doran, the Irish mineral collector and dealer. Kir-wanite is described (Thomson, 1836) as opaque, dark olive green in colour, with fibrous texture, the fibres divergent, forming brushes and filling cavities 'in a kind of basaltic rock'; hardness 2,
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research
Education Level UG and PG ♦ Career/Technical Study