Geography of Sheffield county, from bituminous (ideal for domestic heating) to "Thick Coal", of a semi-anthracitic quality, appropriate for use in iron-smelting and in engine furnaces. Associated with the Upper Coal Measures were valuable iron ore deposits, occurring in the form of nodules. Large quantities of locally occurring fireclay were also exploited, as well as ganister (a clay used to make refractory furnace linings). The city of Sheffield derives its name from the River Sheaf which Until the 17th century was written as "Scheth" or "Sheath". Sidney Oldall Addy equates the origins of this word with the Old English "shed" (as in "water-shed")
University of Sheffield Bioincubator and University Health Centre were also refurbished. A new six-storey building, the Diamond, was opened on 28 September 2015. In February 2016, the university started to work with Sheffield City Council to transform public spaces around the campus. The £8 million project includes building and improving pedestrianisation, crossings, cycle routes, as well as greening the campus. The University of Sheffield is not a campus university, though most of its buildings are located in fairly close proximity to each other. The centre of the University's presence lies one mile to the west of Sheffield city centre, where there is a