	Bonney, T. G. (1890) On the Crystalline Schists and their Relation to the Mesozoic Rocks in the Lepontine Alps. Journal of the Geological Society, 46 (1) 187-240 doi:10.1144/gsl.jgs.1890.046.01-04.15	Journal (article/letter/editorial)
	occurrence of fossils in " schists," reaching the valley of the Rhone by the Eginenthal. This concluded...At the base of the slopes leading from the upper valley of the :Reuss to the Oberalp Pass, and not far...indubitably Jurassic limestone which occurs in the upper valley of the Reuss, not very far off the line of strike...the more recent geological maps published in Switzerland,--we began our work by carefully examining these...Lower Carboniferous series),--extends from the valley of the Rhone over the top of the Furka Pass, is
	*Gramaccioli, C. M. (1975) Minerali Alpini e Prealpini* Vol. 2. Istituto Italiano Edizioni Atlas S.p.A, Bergamo.**	Book (volume)
	cristalli (actino lite, magnesite, dolomite, magnetite, ecc.) e si riconosce facilmente per la consistenza...ben cristallizzati, tra cui ii demantoide, la magnetite, ecc. L'amianto << di serpentino >> si puo ritenere...massime di 5-6 centimetri, associati a b iotite, magnetite, fassaite, ecc.: il materiale della Val di Fassa...specie si presenta nelle fessure associata a magnetite, ematite, rutilo, anatasio e mona zite ; la regione...eritrite, titanclinolmmite, titanite, prehnite, magnetite, pe rowskite, ecc. Tra le rarita della valle

Magnetite from Mittaghorn, Sertig Valley, Davos, Prättigau/Davos Region, Grisons, Switzerland