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T H 



N A T U R A 



H 



fT"\ 



R 



The productions of this kind are fo apt to vary, more or lefs, from 



common 



brms, that they have been divided almofr 



many Genus's as there are diftinct 



Species, and far beyond what nature feems to require. They are eafily known by their 

 hardnefs, tranfparency, and regular forms j and obferved to bear the action of the 

 acid with eafe ; and to elude the force of moderate iires. 



2°. ADAMAS 



Diamond, 



Solidiffima aquea. 

 A diamond. 



Pellucidijjima, e rubr o-jlamme a * 



A rubee. 



r 



PellucidiJJima cceridea colore fugaci, 

 Afaphire, 





Thefe tranfparent and figured ftones are eafily known by their fuperior hardnefs 



and luflre : they elude the force of the Bre and the acid with equal eafe, thoVthe 



laft fort is fometimes obferved to lofe its colour when pufhed by the fire. 







3°. TOPAZIUS 



Topaz, &c. 



f i. Flavus. 



The topaz. 



2. Fuhus. 



The hyacinth. 

 . Ruber. 



The garnet. 



. Purpureus. 



The amethiit. 



5. Viridis. 



The fmaragdine. 



6. E *viridi caruleus. 

 The beryl, or feagreen, 



, Niger. 



The morion. 



> 



The productions of this kind approach very near the diamonds, both in beauty 

 and luftre -, and elude the force of acids with equal- eafe 5 but do not bear the action 

 of the fire fo well, though they ftill retain the general properties of the clafs. 



4 



o 



QUARTZUM 



Arenaceum vitrariorum. 



Cryftal fand. 



Diaphanum albidum. 



Quartz-ftones. 



Diaphanum parafiticum albidum. 



Quartz. 



1 



The Quartz is generally very bard and tranfp 

 of any beautiful luft 



but not fo regular in its for 



of a vitrefcent nature 



gives 



fire with fteeL and 



bears the action of the acid with eafe 





The more compound and opake bodies of this nature come next in order, and 



remarkable for their fup 



hardnefs and fine 



g 



They feem to be formed 



chiefly of the vitrefcent fluor, debafed by a lefs agitated or divided clay 



We fhall difpofe the productions of this clafs under the following Genera, viz. 



\ 



1 



o 



ACHATES 



Mgath, 





Subdiaphanus albidus minute undulatus , 

 Subdiaphanus varie color afus, crujlatus 





anus exalbidus 



Rufefcens. 



A fardonix. 

 Ruber. 



Albefcem punclis rubr 











i°. ACHA 









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