EARTHS. CALCAREOUS. 22. Marga. 
99 
Found in various parts of Britain, Swden, and Germany, at the 
bottom of watvrs, particaiarly thofe which are Ifagnant, and 
becomes reddifh when burnt, in proportion to the oxyde of 
iron which it contains; fometimes whitilii or grey. 
‘thistosa. Indurated, not crumbling in the air, greyiOi, of a llaty 
texture, breaking into difcoid fragments. 
M '.rpaindurata-ftra: contin. Cronst min, 28. B. 
Mail fliiftus. SchmeiJ'. min. i - p zig. 
Indurated calcareous marl. Kirn.van miner. 1. p. 95. 
2. Slaty, crude, green. 
Sthillus viridis. Syst, nat. xii. 3. p 37. n. 4. 
Found ftratified in various parts of Europe, with frequently par- 
ticles of mica inierfperfed, and fometimes the oxydes of me- 
tals, and folSls 
^’ituminom. Indurated, not crumbling in the air, black, a little greafy, 
fliining a little within,, of a llaty texture, breaking 
into difcoid fragments. 
Ciprum fchillofum. S.yst. nat. xii. 3. p, 145. «. n. 
Cuprum ccrroluin. Wall. ly t. min. z. p 292. «. t8. 
Bituminous niarhre. Kir wan miner, i.p. 103. 
Bituminous marl fiiillus. Sebmeffer mineral, i. /. 230. 
Bituminous marl. Themfon them 3 /. 614. 
Found in ftratified mountains of various parts of Germany, fre- 
quently containing the irapreffion of filh and marine plants, 
and frequently the ores or oxydes of copper: colour greyifii, 
blueilh, or browndh-black, according to the quantity of bi- 
tumen it contains, which renders it more or lefs inflamniable: 
has a greafy and fomewhat glittering appearance, and a Haty 
texture: the thin plates area little fonorous: burns before 
the blow-pipe with a black drofs : fpecific gravity from 
2,361. to 2,442. 
ttnonyma. Shining within, hardilli, of a dull iron colour. 
Sernjiere et Vincent de Villas (hem ann, 1784. 2./1.287, 
Pvritaceous limeftonc. Kirm.an mineral, I.p. 104. 
Found near St. Ambroix in France, fometimes fo hard as to ad- 
mit a polifti and ftrike fire with Heel : befides a little fchiftofe 
earth, fulphur, and quartz, it contains iron argil car- 
bonate of lime 
N 2 
