EARTHS. CALCAREOUS. 22. Marga. 99 



Found in various parts of Britain, Siveden, and Germany y at the 

 bottom ot waters, particularly thoie which are ftagnant, and 

 becomes rcddilh when burnt, in proportion to the oxyde of 

 iron which it contains j fomctimcs whitilh or grey. 



schittosa. Indurated, not crumbling in the air, greyifli, of a llaty 

 texture, breaking into ciifcoid fragments. 

 M^rgaindurata ilrat. contin. CV^/zuf. /«/>» 28. B. 

 Mari ihiftus. SchmeiJJ. min. \ p 229. 

 * Indurated calcareous marl. Kiy'i.vanminer*l»p.^!^» 



2. Slaty, crude, green. 



Schiilus viridis. SystyHat. xii. 3. />. 37- n. 4. 



Found ftratihcd in various parts of ^aro/<?, with frequently par- 

 ticles of mica iuicrfperfed, and foraetimes the oxydes of me- 

 tals, and foffils. 



hituminoia. Indurated, not crumbling in the air, black, a little grcafy, 

 ihlning a liiile within, of a ilaty texture, breaking 

 into difcoid fra2:ments. 

 Cuprum fchillofum. >*)st. n&t. xii. 3. /, 145. n. i J. 

 Cuprum corrolum. Wall. fyit. ruin. 2. p. zqz. n» 18, 

 Bituminous marlite. Kiy^wan miner. \. p, 103- 

 Bituminous marl fhiftus. Schrne/Jer mineraL I. p, 230^ 

 Bituminous marl. Thomfo?: chem 3.^.614. 

 Found in flrat'fied mountains of various parts of Gfr»7^»>", fre- 

 quently containing the impreffion of iidi ?ind marine planes, 

 and frequently the ores or oxydcs of copper: colour grey ifh, 

 blueifh, or brownilh-hlack, according to the quantity of bi- 

 tumen it contains, which renders it more or lefs inflammable: 

 has a grcaly and fonicvvhat glittering appearance, and a flaty 

 texture: the thin plates arc a little fonorous : bums before 

 the blow-pipe with ^, black drofs ; fpeci£c gravity from 

 2,361. to 2,^42. 



amnymum* Shining within, hardifh, of a dull iron colour. 



Ser-xtiere et Vincent de Villas chem ami, 17H4. z^p.z^j, 

 Pyritaccous limeilone. K-rx^an mineral. 1. p, 104. 

 Found ViZ^x St. Amhroix in France, fometimes fo hard as to ad- 

 mit a polifh and ftrike fire witli Heel : befides a little fchiftofe 

 earth, fulphur, and quartz, it contains iron ,!,. argil ^„. car- 

 bonate of lime !|,, 



N 2 



