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ACHATES 



Agate* 









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Gemma Stephani Latitiis. 



. Subdiapbanus cinereo nebulofu 

 A chalcedony, 



8. Subdiapbanus fir at is variegat 

 The onyx. 



9. Colore s profitu mutatis. 



The opal. 



10. Virefcens radians. 

 The oculus cati. 







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anfparent in fome degree ; of a fmooth fliining furface 



Thefe ftones are t 



lifhed ; and generally clouded with different colours difpofed variously in the mafs 

 hey anfwer all the qualities peculiar to the clafs with regard to the free], the fire 



and the acid 









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2 . SILEX 



Flint. 



■► 



,; 



Uni color albUus. 



White flint, or fire-ftone 



Subfufcus unicolar. 



Flint. 



Vnicolor ruber a 

 . Blood-flone. 

 Vnicolor viridis. 



.. 1 I - r% 





rt' 





( 





The green blood-ftone 



Strati s varus. 



4 



Flint is commonly opake ; but when reduced into thin plates, it becomes more 

 or lefs tranfparent : it is generally of a fine grain, and uniform colour ; but is fome- 

 times found divided by foreign feptae. It is obferved of all fizes, and remarkable for 

 its vitrefcency. 



3°. SCRUPUS 



Pebble. 



1 i Arenaceus nit ens, majfulis fubrotundis. 

 Varie et pule ber rime nebulato-variegatus \ 



2. 



The Egyptian and Bohemian pebles. 





The productions of this kind, are generally found in fmall detached maf- 



fes ; and feem to be principally compofed of the vitrefcent fluor debafed with a finer 

 clay, and fome metallic or terrene particles : they are of no determined figure or re- 

 gular flructure, but may be eafily known by their fine grain, fmooth polifh, and ele- 

 gant variety of colours difpofed in a clouded uneven form. They anfwer all the cha- 

 racters peculiar to this clafs. 



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4 <\ PORPHIRIUM 



1. Columnar e nigrum Hiberni a . 

 . The Giant's caufeway ftone. 



2 . Viride maculis minor i bus albis variegat urn. 

 The green porphiry. 



3 . Rube Hum maculis minor i bus albis variegat urn. 

 The red porphiry. 



4. Subcinereum maculis majoribus dijlin&is variegatum. 





The plumb pudding ftone 



Porphiry is eafily diftinguiflied by its great liardnefs, and uniform though fpotted 

 colour ; it is found in large rnafTes, bears a fine polifh, and anfwers all the other 



characters natural to the clafs. 









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5 . LYDIUM 





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