2o6 



EARTHS. AGGREGATE. 64. Arenarius. 



C. With an, argillaceous cement, 



porcelanus, Confifting of grains conglutlnated by a cement of porce- 



lane clay. 

 Cos partic.^arenac. Syst.waf, xii. 3.^, 64, «. 14. 



Lapis arenaceus. Cronlh miner, fe^. zy^, i, x . 



Found in a coal-pit near Boferup in Nornvay: under ground it 



is foft, but hardens when expofed to the air, and does not 



melt in the iire. 



■fahlunensis Confifiing of minute white grains, with a cement of 



common iuT.mjs alumina. 

 Saxum cotac. rufuin. Syfl. nat. xii. 3. /. 74. ». u. 

 Found at Fahlun in Snxjedent wliere it forms the bafe of copper 

 mines. 



cokratus. Confifting of fmaller and nearly equal grains varioufly 



tinged. 

 Cos colorata. ^\st. nat^ xii. 3.^.64, «. 13. 

 Found fcatteredly here and there, of a yellow, green, blue, or 



reddifli colour, and may probably be only a variety of A. 



ferruginofus. 



stratapus. Hard, confifting of equal tranfparent grains. 



Cos partic. arenac. S^st. nat. xii. 3. p, 63, n. 12. 

 Found alm:)il: every where : it hardens in the air, and is fait 

 when found under fait water. 



friabilis. Confifting of minute grains flightly cohering, 

 Cos partic. friabil, Syft. nat. xii, 3. p. 63. n. 8. 

 Found at H elfin glurg in "Nor^way^ 



fssilis. Separable into tables or plates. 



Co5 fillilis, Sxft. nat.yCx'x, 3. p. 62, «. 7, 



Cos fifliiis* Wall. fyst. i , p. 196. «. 7. 



Found in Britain^ Sn-vecLui Spain^ Germany ^ 8cc, vary in*? much 

 in degrees of hardnef?, fize and tranfparency of its grains, 

 thickncfs of the plates into which it may be feparated, and 

 colour, but is generally v/hitifh or reddifh. It may be ufed 

 for tiling, unlefs it be too porous. 



glareosus. Soft, confifting of very minute grains. 

 Cos glarcofa. Wall fyst. i, p, 188, «. 2. 



Found commonly '\n Britain, Snvedeny And. Peru: colour grey, 

 reddiib, yeliowifh, or greenifh. 



D, fVith a metallic oxyde fupplying the place of a cement, 



^mnigcnius. Hard, confifting of grains conglutinated by a pement of a 

 fmall qi;antity of oxyde of iron. 

 Saxum lapillis, &c. Syft. uat. xii. 3. /, 80. n, 38, 



