Rubha na Carraig-gèire

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 […]

Iona Chemistry

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.