EARTHS. ARGILLACEOUS. 38. Mica. 131 



Found cverj' where in Granite and other ftones, intermixed 

 among rheir component parts, in almoft innuruerable hues 

 and colours, bat generally with a coppery filvery or gold 

 metallic luRrc, 



undulata. With undulate gold foIiatJons» 



Mica ftexuo-undulaia. Syft. nat^ xii. 3.//. 60. n, io. 

 Mica fiflilis. Wall. fy/l. min. 1 , ft, 372. ». 4. b, c. 



2. With firxuous brittle gold foliations* 



MicA Hungarica. Syst, nat^ xii. 3. f, ^g. n. 6, 

 Talcum luteum. Wall f,'st. min, l. />, 3.75'. ». g. 



Found in the mines of Duhcurlia. 



himispha:. With Iiemifpherical concentric foliations, 

 rica. Mica I'quamis hemiiph. Syfi. nat. xii. 3. /. 59. n. 8, . 



Mica hemifphcrica. ' Waller Jyfl, \ , p. -x^jy* n,6. 

 Found. in Finland^ in the haixlet Kimito, conrtiiuting a com- 

 p.>nent part (;f decaying rock, white, very fhining, and re- 

 fembiing in bulk and figure, the half of a fplit psa. 



striata, Wtth the foliations radiating. 



Mica partic. oblong, WalL F^st» mtn. l,p, 372. n. 5. 

 Found tn Saxony^ in lloncs, cinereous or blacky becoming 

 whiiifh or yellowifh in the fire, and approaching near to a 

 honiblend. 



ciystallixa^ In Hx-fided tables. 



Mica iquamis cref^is. Syst. vat. xii. 3, /?. 60. ». 9. 

 Mica figuradetcrminat. W{,ll.f;fl. 1. p, 373. k, 7. 

 Found in the mines o^ Dalecarlia, in Saljlurg and Zimnvaldini 



the tables fometimcs icaitered, fometimes aggregate in a 



lleliate manner, or diipjfed in c^lamns, 



prismatica, Brown, in 9-fided priCms. 



Kiapri>tl> Berg- Jonrn. 1790, 9. /). 227. 

 Hoffm. Berg, yourn. 1789 i. p, 156. 



Found in the mines oi Saxony, -ear Schneehergf in rock zam- 

 pofed of quartz and feidfpar, opake, a liule fhining wichio. 



teptdoh' With fcattered, f?at, cohering, pale violet fcales. 

 tisHi, Lepidqlite, Lilalitc. Kir^wan m:neral. \. p. 208, 



Lepidolite, Lilalite. Thomjon ch^m. 3./. 511. 

 Found in f^^cra^ia and Sudermaniay mixed with granite in 

 large amorphous mafles, and is compofed of thin plates which 

 Separate eafily : colour of the mafs violet blue, of the thin 

 plates filvery white: powder white with a pale red tinge : 

 before the blow. pipe it froths, and melts eafily into a white 

 femiiranfpareni enamel full of bubbles: difiblves in boiii^ 



R 2 



