ao8 



EARTHS. AGGREGATE. 64. Arenarius. 



fous; the mica white or black, and difpofed longitudinally 

 or in dots : it has generally a flaty, fometimes an undulately 

 flaty texture, and may cafily be feparatcd into plates: it is 

 found in layeKs, and when broken, has a rather glittering 

 clayey appearance, exhibiting moilly a fine grain. 



fnaiaris. 



Hard, confilling of unequal angular grains of quartz and 

 feldfpar interfperfed with mica. 

 Cos particUlarij, &c. Syft. nat, xii. 3. /. 64, «• 15. 

 Cos partic. major. Wall, fi ft- i./>, 199. n. 10. 

 Mill-ftone. Schneifjer mineraU I. f' 328, 



2. Containing garnets or cryllallized fhorl. 



Saxum molinum. Syft, not. xii» 3. p. 75. «. 17. 



Found generally through Eurepe : is of a very hard texture, and 

 is u(ed for corn-mills : the grains of quartz are tranfparent, 

 generally white, and larger j thofc of the feldfpar are lefs, 

 more opake, and grey. 



KompaBus. Hard, cenfifting of grains of ochre-yellow quartz and red 

 garnets. 

 Cos partic. arcnac. ^yft* nat^^w. 3. /)»03. ». 1 1. 



2. Fiflile, and mixed with filvery mica. 



Saxum pundlatum. Syft, nat. xii. 3. p, 78. «. 28. 



Found in Dakcarlia and Weftrogoth in S^wedeny and is ufed as a 

 coarfer kind of mill-ftone. 



radiam. Hard, variegated with columns of black fhorl difpofed in 

 a ftellate manner, and interfperfed with grains of 

 purple garnets. 



Sax. cotac. iiriis atris. Syjt. 7iat, xii. 3. p» 74, «. 10. 



Found in ^luedeny of a pale colour. 



decuisatus. Hard, reddifli-white, varied with black ered and decuf- 

 fating fcales of hornblend. 

 Saxum cotaceum, &:c. Syft. nat, xii. 3. />, 75. ». 15. 

 Found at Killmorac in S<weden, 



frumtntallu Varied with interfperfed foliations and lanceolate fpots of 



talc. 

 Sax. cotaceo-talcof, Syft, nat, xii. 3./. 75. n, 16, 

 Found in G^r/;;tf«y. 



^arkksuis White, in fmall grains, filtering water, with ferruginous 

 perforations. Tiger-Jione, 



Cos partic. glareof, 5v//. nat, xii. 3. p. hz, ». 5. 



Found in Nericia and Weftrogoth in Snxeden: the fpots and per- 

 forations originate from fmall pieces of pyrites imbedded, and 

 which moulder into an ochraceous oxyde. 



