EARTHS. ARGILLACEOUS. 3i.Argil!a. 



lis 



Sapo. 



fcmmtmts. 



inditrata. 



flefh-colour, with fometimcs Mack fpots or {hrub-like ramifi- 

 cations : furface fmooth and polifhcd likeag-.tc: fradure 

 conchnidal, with angular fragmen'.s : contains filica 47,0. 

 alumina 19,0. carbonate of magnefia 6,0, carbonate of lime 

 5,4. water and air 17,0. Bergmsin. 



Greafy, ligluifli, very foft, fliining by fridion, adhering 

 to the tongue, brownilh -black. 

 Bergfeif. Werner in CroniK mineral 84. 

 Found near Oikutfch in V aland, of an earthy texture. 



Very foft, greafy, adhering to the tongue, plaftic, flain- 

 in2 the fingers a little, of an earthy texture, growing 

 red in the fire, and before the blow-pipe melting into 

 a greenilh glafs. 



Argilla communis Crond. minsral. go. A. 



Brick-clay. Schmeifser mintr- i. p. 163, 



C^-mmon clay. Kirivan 7niner 1.^.179. 



Common clay. Thoynfon chem. 3 ^■535- 



1. Of a bliieifli colour, 



Argdla communis. Syn nat xii. 3. ^. 202. «. 9. 

 Arg. vitiefc. rudis. Walt fyst. min^ I. />. 40. «. I, 



2. A.rgijia figulina ficcitate rupturis fubteflcll&ta. 

 Syst^nat. xii. 3. p. 202. n. IC 



Argilla vitrelcen*, exficcata teflularis. 



WalLffii. mineral. \. p 44, n. 3. 



Argilla incarnaia. Syst. nat. xii, i, p, 202. n. 1 1. 



3. Linus. Terra latericia, Vogel miner. 31. 



Found in almoft every pare of the globe, frequently forming 

 vail llrata a little below the furface, and ohen bearing the 

 imprefiions of vegetables : colour blueilli or yeliowilh-^rey, 

 finoke-colour, dvll blueifh, rarely green or fleOi-coIour, and 

 impregnated with a greater or lefs degree of filica. 



Soft, a little greafy, adhering (lightly to the tongue, crum- 

 bling and fofiening in water. 

 Argilla arete cohcr. Wall. Jyll min. i. />. 62 ? 

 Indurated clay.. Kirivan mineral, i. /. 131, 

 - Indurated clay, Thomjon cbem. 3. /. 536. 



2. Granular when dry. 



Argilla vitrefcens. Wall, jysf, min. i. p, lO. n. ^. 



Found in every part of the globe, iightifh, ycllowifli, blueifh or 

 greenifh-grey, reddifli- brown, dull rofy, or greeniih, or varied 

 with rounded fpots: of an earthy texture, and dilcovers but 

 little dudility : falls to powder, but does not difFufe itielr m 

 water, and is fomctimes fohard as to lerve the purpoies of 

 building Hones. 



P 2 



