YORKSHIRE ALUM WORKS. 243 



found in beautiful specimens, and are sought after with oihersubstan. 

 avidity; they are chiefly cut into seals, bracelets, rings, and bTthe'waTes^ 

 other ornaments. 



Garnets are found imbedded in quartz. These occur but 

 rarely. 



A variety of flints resembling the Egyptian pebble are 

 very common; these, when broken, present a number of 

 concentric lines, resembling the different yearly growths in 

 timber; and variously coloured. Sometimes fossil echini 

 are found enclosed in the flints, others contain cubical py- 

 rites. 



Jaspers of a red and green colour, elegantly variegated, 

 occur in abundance. 



Some of the nodules of quartz contain very fine small 

 rock crystals, regularly formed. 



Mica is sometimes to be met with in the sandstone strata. 



Two species of hematites^ or bloodstone, red and green. 

 The green is very scarce. 



Pieces of amber are sometimes thrown ashore by the sea. 



Coral is also found but of a very inferior kind. 



The OS sepice, or bone of the cuttle fish, is common, the 

 fish itself is often cast ashore. 



The madreporae are frequently to be met with. 



Puddingstone, porphyry, granite, and whinstone are found 

 in masses of various sizes. 



The metallic ores are less numerous. Iron is the most 

 predominant. 



Manganese is met with in small quantity, in the state of 

 a black oxide. 



Lead has been found crystallized, but the specimens are 

 rare. 



The sandstone strata are found of various qualities, sel- Sandstone 

 dom very white, generally of a brownish red : sometimes stiata. 

 the quantity of ferruginous matter contained in them is so con- 

 siderable, as to make them very hard. Even the softer kind 

 of sandstone, by exposure to the atmosphere, is found to 

 grow much harder, so that it is very useful in building. The 

 thickness of the strata varies from four yards to upwards of 

 fifty : the general inclination or dip is to the S. W. 



Immediately under the sandstone strata are to be found Springs, 

 R 2 springs 



