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I 



OF f A M A I C A. 



41 



Thefe are inflamable fubftances of a coarfer fort ; they are generally heavy, 

 black, and folid, with a very large admixture of earth, and a more grots fufphureous 

 matter : The Jett feems to have fomething of a woody grain, and is generally found 

 in detached merles ; but is fo like the other fpecies, that I do not think proper to fepa- 

 rate it from them; though they are always more ihining,and found in continued ftrata. 



IV°. Such as have a large admixture of earth, with fome micaceus and metallic 

 particles, and a great quantity of mundick, and other volatile acrid parts. 



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1 , Subnudum arfenicale micaccum, aureo fplcndem> five 



Auripigmentum off. 



1 °. AURIPIGMENTUM { Common orpiment. 



2. Cinereo-carulefcensy mi cam. 

 Blue orpiment. ^ 



The orpiment is a glittering inflamable fubftance, that has fomething of the ap- 

 pearance of mica : it is foluble in oil, and fufible in a moderate heat ; but when pufhed 

 by a ftrong fire, yields a great quantity of acrid volatile particles, with a difigrceablc 

 (harp fmell. 



Equate nudum fubfavefcens. 

 Yellow Sandarack. 

 2°. ZARNICUM ^ 2. Album fragment 'is planis. 



White Sandarack. 

 1 3. Album fragment is convexis. 







The Sandarack is an inflamable Foffil fubftance of a plain uniform flructure, 

 and compact texture : It is foluble in oil, and burns with a whitifh flame, and no- 

 xious fmell. 



T. IV. 





De terra metalka^ & mineris variis : 

 Of the metalic Earthy and various mineral Subftances. 



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HAT there is a principle of this kind in nature, and that very different from 

 the other forts of earth (of which we are re/blved to give fome account hcre- 

 is evident from the remit of thofe mineral fubftances that are daily tortured 

 by the fire, and the acid (a) ; as well as from their apparent qualities in a more per- 

 fect ftate. But, as it is feldom found without a large admixture of the phlogiftic, 

 I thought it moft natural to place the productions of this clafs immediately after the 

 foregoing ; and to difpofe them fo, that thofe which partake molt of that principle, 

 may ftand foremoft in the clafs. 



The following feems to be the molt natural diftribution of the productions of this 



kind, viz. 



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1°. Such as have a large admixture of fulphureous particles, with fome mundick 

 or orpiment, connected in a grofs metalic, and clayey bafe j having all the appearance 

 of a metalic ore, but not productive of any. 



1. 



Scintillans ferreus amorpbos. 



1°. PYRITES 1 2 . Ferreo cupreus mat rice deli que fcenti. J t s N 



Pyrite. j 3 . Ferreo cupreus matrice vitrefcenti. 



4. Ferreo cupreus matrice apyrd. 



(a) Thefe bodies in general, however their texture and compofit 



fily reftored to their primitive flat 



re. 



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The 



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