194 EARTHS. AGGREGATE. 6i. Porphyrins. 



Found in Ep-pt, Arabia^^ Greece, Italy, South of France^ Siberiuy 

 and moft parts of Europe^ foinetimes detached, fometimes 

 forming rocks, mountains, or their principal parts, opake, of 

 a texture more commonly approaching to the conchoidal than 

 the flaty, hard and admitting a finepolifli, breaking into in- 

 determinate fragments, eafily melting in the fire ; generally 

 of a common form, rarely in prifms and then always mixed 

 with other bodies, as hornblend, mica, fiiorl, or quartz; 

 infinitely varying in the colour, form, dillribution, and mix- 

 ture, of its conilituent parts; the feldfpar generally white or 

 rcddiih, immerfed inj^fperin the form of dots, fpots, flripes, 

 or prifm?, and tometimes mouldering away and leaving ca- 

 vities; the jafper redy brown, black, or green, rarely dull 

 grey or of two colours, as black and green, red and orange. 

 It was ufed by the ancients in the ilrutlure of columns, tem- 

 ples, and edifices of the higheil orders. 



corsicanus, Compofed of jafper r and a£linote. 



Marmor verd. di Corf. Freker Br. a. Welfch. 2\,p, 357. 

 Found in Corficay white with violet fpots and rays of green 

 adinote. 



the jafper red 



amiantinus, Compcfed of jafper, afbeft, and quartz. 



Found detached in the province of Mansfeld , 

 the afbell greenifli, and the quartz white. 



nltens. Compofed of jafper, and nnica. 



Hoepfn, mag, hel<v. natur. i. p. 278, 



Found in Sivitzerland, and near Annaherg in Saxony. 



scorlinus, Compofed of jafper, and fhorl. 



Hoepfn, maga-z., hel'V, natur. I ^ /^ 278. 

 Found in Sivitzerland, 



effer'vescens, Compofed of jafper, and fpar. 



Hoepfn. mag, hel'v, natur. I. />, 27?. 

 Found in Siiitzerland. 



granatifer^ Compofed of jafper, and garnets. 

 Hoepfn. mag, helv. natur » \, p. 278. 

 Found in S'voit'z.erland. 



cryjtalhnus. Compofed of jafper, and cryftals of quartz. 

 Hoepfn. magt hel'V. natur, i . p. 278. 

 Found m S-vuitzerland. 



Achates, Compofed or jafper, quartz, rock.cryftal, amethylT:, chal- 

 cedony, cornelian, and onyx, hornitone, and flint, va- 

 rioully combined together. 

 Silex rupeilris. Sy(l. nat, xii. 3./. 70. n. lO, 

 Achates duriffima. Wall. /fit ^ i,p. 284. «. 22, 



J I 



