276 
metals. 85. Ferrum. 
Found in the mines of Hungary and the Harx,, and confifsof 
OX) de of mm, hornlione, quartz, and jafper, and fometiincs 
a fn.all portion of gold ; it frequently appears eroded. 
argtllaceum Soft, opake, without lu/tre, dry. 
Atgillaceous iron ftone. Ki'nuan niincr. 2, p. 
Argillaceous iron ftone. Schmeijjer min. 2. p. 102 
Argillaceous iron ore. Thom/on chem. 4 p rg 
Argilla«ous iron ore. SeWj Urit. mm. U 61. 106, 107. 
Found in var ous parts of Great-B itain, in Italy, Sa.xony, Get' 
many Bohemia. &c. in det.ched lumps or forming ftrata. 
fiitular, cellular, or varioydy imitative: colour reddifh or 
yel oviilh grey, or various fliades of brown or black, with tl’.e 
furface often uneven and bunchy ; adheres to the tongue, 
and has acompad, even or uneven, flaty or fplintery frac- 
ture: it generally gives a reddifli -yellow ftreak, and has an 
earthy imell when breathed on: fpecific gravity from 2,673- 
.”'®^"rapoiod of oxydeof iron, alumina, lime, 
ana liltca, in various proportions, 
0 (hra, Not magnetic, without hiftre, opake, friable. 
Ochra ferri. Sytt. nat. xii. 3. p. ig2. 2. 
Ferrum acido folut. Wall. fy/t. 2. p. 258, 259. 
Iron ochre. Kirnvan miner. 2. p. i6y. 
Red ochre. Kir-uoan miner, z. p, 171, 
Red crayon. Thomhn chem. 4 p. 39. 
Found in every country abounding in iron ores, fometimes id 
folution in waters impregnated with iron, fometimes com- 
pact or hardifh, rareiy fibrous in a fteliate manner: colour 
various fhades of red or yellow palling into brown by expo- 
fure to the air: ftreak red or yellow: it adheres to the 
tongue, flams ftrongly, and is principally employed in draw- 
ing and writing. 
cmrulea. Not magnetic, friable, earthy, without liiftre, becoming 
blue by expofure to the air and brownifh in the fire, 
changing it.s colours in a folution of foda. 
Ferrum cceruleum. Wall.fyU. 2. p. 260. n. 33. 
Blue martial earth, Kirnvan miner. 2. p. 185. 
Blue earthy iron ore. Schmeifer miner. 2. p. 107. 
Blue iron earth. Thomjan chem. 4, p.67. 
Azure iron ote. Strwerby Brit. min. t. 10. 
Found in many parts of England and Scotland, Siberia, Euffa, 
Snveden, Nomxay, Poland, Germany, &c. in marlhy grounds 
at various depths, generally in an earthy Hate and without 
an V regular lhape, adhering to the Hones and pebbles which 
' ^ lurrounoit: colour generally whitifh when firll taken from 
, the foil, and becoming gradually of a fine blue, by expofure 
