Icollumkill, antiently called Iona, lays from Colle to the south and south-east about thirty-six myils of sea, and is distant from the south end of Mulle about one myil of sea. It is two myills in lenth, and almost from east to west, and one mile in bredth. It is very fertill; commodious for fishing […]
In this Iland is marble enough, whereof the late Earle of Argyle caused polish a piece at London abundantly beautifull. In a particular place of the Island, neer the sea ebbing and flowing thereinto, there are found transparant stones of all colours, but most ordinarily green, much resembling agatts: they yield to the file and […]
The nephrite of Iona has a specific gravity of 2.595, H 3.5, SiO3 44.85, MgO 36.05, FeO 3.6, Al2O3 1.3, HO 13.55. — Cyclopaedia of Chemistry with Its Applications to Mineralogy, Physiology, and the Arts, Robert Dundas Thomson, Griffin and Company, 1854, page 379.
A small geological outcrop at the south end of the isle of Iona is the source of a rare stone known since the time of St. Colum Cille and treasured for centuries. Iona greenstone (also called Iona marble, nephrite, jade, and a host of other more-or-less mineralogically correct names) may be found on the beach […]