94 O F S T O N E S. 



5. Abluejafper, variegated with a yellowifh-grecn, in beauti- 

 ful flreaks and blotches. 



6. A black jafper, elegantly variegated with brown. Thefe 

 five from the fliore of North Tyne, below Cholkrford-bvidge. 



7. A black jafper, variegated with a pale yellow, with fome 

 fmall veins of a light blue. From the fhore of Wark's burn, in 

 Tynedale, near its oftium. 



8. A bluifh-black jafper, with flefh-coloured and green veins 

 and clouds ; capable of a beautiful polifh. From the fhore of 

 'North Tyne. I have alfo found it on the fhore of the brook at 

 Ovingham, near its oftium. 



The bluifh marbly jafper, and the black marbly jafper, both 

 variegated with white (qj, are frequent on the famefhores. They 

 are always found in loofe nodules, and anfwer all the tefts of 

 cryfta.l, though ufually taken by inaccurate obfervers for frag- 

 ments of marble. They ftrike fire with fleel, do not ferment 

 with acids, and are vitrifiable. 



gaffers yield no Phofphorus. 



Of Granites, formed of concretions of Quartz and micts, and an- 

 fwering the fame tefls as Jafpers, we have the following kinds 

 and varieties ; founcl in nodules, and loofe mafles, but never in 

 flrata. 



(q) Jafpis marmorca, fubcaerulea, albo variegata. 



Jafpis marmorcus, nigricans, albo variegatus. Hill. Hift. Foff. p. 590. No. 17. p. 591. 

 No. 1 8, 



i. A 



