34 Tbe feveral SPECIES 



to the yellow, or copper -pyrites ', rightly claim the 

 title of white- pyrites •, as compared with thcie it 

 certainly mews white. 



The yellowifh and yellow pyrites are not near fo 

 hard to diftinguifh as the white. The former is 

 a fort confuting of fulphur and iron, and having 

 little or no arfenic or copper, and in different views, 

 now called fulphur- pyrites, again iron-pyrites, and 

 at Friberg Pimply pyrites. It manifests a middle co- 

 lour between the true copper pyrites, or the pyrites- 

 copper- ore and the white pyrites -, which colour can 

 neither be called a white nor a yellow, but a yel- 

 lowifh, and difcoverabie upon comparing the white 

 and the yellow therewith •, as in regard to the white 

 alone k mure be deemed to be actually yellow, and 

 in regard to the yellow alone, actually white -, ob- 

 ferving to learn to diftinguiffi it from the dark 

 vein-Hone, the dark ores and minerals in mines, 

 as mock-lead, glitter, &c. where its yellownefs 

 cannot ftrike the eye \ and to guard againft being 

 impofed upon by the external, often gold -colour, 

 v/hich is only fuperficial ; remember to break the 

 fample, and judge of it as it mall then mew in- 

 ternally coloured*. 



The yellow pyrites may be eafily diftinguifhed ; 

 its peculiar characterises are the copper and ful- 

 phur it holds : its yellow nearly coincides with a 

 Jijkin- green, which might induce one to call it a 

 green pyrites rather. But as in the colour, called 

 fifkin-green the yellow is the ground-colour, a little 

 green only ferving as a heightening ; and as the 

 fecond or middle fort of pyrites muft have been 

 called a yellow and not a yellowifh, which the eye 

 oppofes ; and then as the adjunct, green, might 

 not have been \o exprefiive, but apt to mifiead to 

 the miftaking it for a very different ore and 

 mineral, done over with a copper-green or verde- 

 greafe ; thefe are fufficient grounds tor acquiefcing 



ia. 



