98 
EARTFIS. CALCAREOUS. 22. Marga. 
,I 
niktlca. 
Mjr! ^homfon chem. 3. ^.614. 
Argillaceous Marie. Sonjuerby Brit. min. tab. 14. 
1. Argillaceou.'!, lubricous, friable, plaflic. 
Wall. fist. min. I. p. 6g. «. 1. 
2. Argil'accous, compaft, dry, pure, with very fine particles. 
Wall. fyst. min. l, /.ft. n. 2. 
Smcflis (ubcilis. Carth. min. p. 7. n. I. 
3. Cretaceous, foiling the fingers. 
Wall. Jy St. min. l. p. 72. 3. 
4. Mixed with arenaceous particles, crumbling to powder in the 
air, a little greafy. 
Wall.JyJi. min, I. p. 72, n. 4. 
Found in almoft ctery country in Europe, in ftrata : colour 
whitifli, yel)owi(h-white, or yellow ilh-grey, and grows paler 
in drying; foinetimes found mixed with Mica gyplum or 
fand, in the latter cafe it is fuitbic into a tranfparent glals, 
fonietimes impregnated with iron, very rarely with other 
metals : generally contains from 60 to So per cent, of mild 
carbonate of lime, the remainder of alumina or clay : fpecific 
gravity from 1,600. to 2,400. 
Farinaceous, brownifli, cinereous when burnt, mi.\ed with 
mould- 
Argil’a mixta humo. nat. xii. 3. p. 205. n. ig. 
Argilla lubfufea. Muf.TeJf. 110. 
2. Vitrifying. Wall. mm. p. 31. 
Wall. Jyst, min. I. /. 75. ». 6. 
Found in the plains of E'^ypt annually overflowed by the waters 
of the Nile, where it is left by depofition after their recefs, 
and is highly fertile. ?) In Upland in Snsjeden. 
fatiscens. 
Very foft, fiffile, greyilh, crumbling to powder in the air. 
Schiftus margaceus. fiyst. nat xii. 3. p. 38, ». 8. 
Mtrga indurata fatifeens. Cronst. min. feS. 27. 
M rga ind. fill'. Wad. fyst, mm. i./. 73. «. 3. 
Found in thicker or thinner llrata, in Snsteden, Germany and 
S’witzerland, often between calcareous llrata ; colour yellow* 
ifh, greenifli, blueiih, with often a rufous tinge. 
porosa. 
Indurated, porous, precipitated from waters, breaking 
into indeterminate fragments. 
Tophus Lurius. Syst. nat. xii. 3.71. 186. n. i. 
Porus aqueus folidus. Wall. min. 331, 
Tophus folidus. Wall Jyst. min, 2. p. 3g4. «. 17. 
2. Tophus argillaceus. Syst. nat xii. 3. p. igo. k. 17. 
Indurated calcareous marl. Kirwan miner. p. gj. 
Indurated marl, Schmeifser min, t. p. 2 2g, 
