64 Transactions of ilie Clifton College Scientific Society. 



Westbury ; enclosing knee-head crystals of gcEtliite, across the Suspension 

 Bridge, and Winford ; also in geodes ; enclosing yellow or red oxide of iron, 

 and therefore called ferruginous quartz, at Koyal York Crescent ; smoky 

 quartz, Winford. b, Amethyst ; colour supposed to be due to iron ; 

 splendid crystals, formerly at Providence Iron Mine, Ashton ; amethys- 

 tine quartz still found there and at Winford. c, Chalcedony ; Cheddar in 

 geodes ; Dundry in oolite, d, Jasper ; ribbon jasper, said to have been 

 found at Tortworth ; pseudo-morphous after fluorspar, near Bristol. 



12. a, Talc ; Magnesium Silicate ; foliated at Woodford Bridge in basalt. 

 b, Steatite or Soapstone ; same locality, 



13. Basalt ; mixture of Augite and Felspar ; Augite ; Calcium, Magnesium 

 and iron silicate : Telspar ; Aluminum and Potassium silicate ; Woodford 

 Bridge. 



14. Prehnite ; one of the Zeolites ; hydrous silicate of Aluminum, 

 Calcium, with a little iron ; also at Woodford Bridge, but not of late 

 years. 



15. Gold ; in minute quantity at Clevedon, according to Mr W. 

 Stoddart. 



16. Anhydrous oxide of iron, a, Specular Iron ; in crystals ; Lias 

 near Bristol, b, Red Haematite ; massive ; abundant at Royal York 

 Crescent Mine in Millstone Grit ; common in Carboniferous limestone, 

 especially the upper part ; Providence Mine, Ashton ; Winford ; Clapton 

 in Gordano ; pseudo-morphous after calcite, Avon section, c, Red Ochre ; 

 red hsematite mixed with clay ; accompanies the above generally. 



17. Limonite, or Brown Hsematite ; hydrous oxide of iron ; FejOj 

 (H20)2 ; a, massive ; with red haematite, b, stalactitic ; very fine at Royal 

 York Crescent and Clapton, c. Yellow ochre ; earthy ; in small quanti- 

 ties occasionally at the mines. 



1 8. Gcethite ; hydrous oxide of iron ; Fefis, HjO ; crystals on limonite, 

 Clapton and Royal York Crescent ; in sparry cavities of limestone. 

 Black Rock ; penetrating quartz, Ashton, Winford ; in geodes, Cheddar. 



19. Iron Pyrites ; iron di-sulphide ; cubes in coal at Ashton ; Rhcetic beds, 

 Aust ; Lias, Horfield ; disseminated through shelly limestone. Black Rock. 



20. Clay Ironstone ; mixture of clay and carbonate of iron ; Coal 

 Measures near Bristol. 



21. Vivianite ; Iron phosphate ; said to have been found in Alluvium 

 near Clifton. 



22. Melanterite ; Iron Sulphate ; Fuller's Earth pits, Widcomb Hill, 

 Bath. 



23. Pyrolusite ; Manganese di-oxide ; in a cutting on the Downs near 

 the College. 



24. Manganite ; hydrous oxide of Manganese ; Churchill, Mendips, 

 Trias, Clevedon, near Royal Hotel. 



25. Galena ; Lead sulphide ; curiously flattened octohedral crystals in 

 veins of calcite traversing limestone, Avon section, at foot of new zigzag ; 

 Kings Weston Down ; Mendip Hills ; Clevedon, in Trias. 



26. Mendipite ; chloride and oxide of lead ; only in Mendips ; not for 

 the last twenty years. 



27. Malachite ; Copper carbonate ; Triassic beds, Clevedon, near Royal 

 Hotel. 



28. Calamine ; Zinc carbonate ; Shipham, Mendips. 



29. Smithsonite ; Zinc silicate ; Shipham. 



30. Blende ; Zinc sulphide ; Shipham. 



2ENoy.l31b 



