[ X38 1 



Species of Stones^ 

 The PETRiE are divided into five orders^ 

 I. H U M O S ^. Slaty Stones. 



I. ScHxsTus. Slate. 13 fpecies ; among 

 which are, 

 Tabularis ; TaMe 



5. Ardefia ; Blue Houfi 

 Slate, 



9. Nigrica Black Crayon. 



Slate. 



3. Atratus 5 Black Shale 



JL CALCARI^. Calcareous Stones. 

 2, Marmor. Marble, 15 fpecies. 



1. Schiftofum ; Black 



Jlaty Marble, 



2. "Nohiky ParianMarble, 



and all its varieties 

 in colour and va- 

 riegation. 



3. Florentinum ; FloreH- 

 tine Marble, 



6. Rude; White-grain 



Limefione, 



7. Micans ; Scaly Lime^ 



Jlone. 



3. Gypsum. Plaifter Stone. 3 fpeciesi 



t. Ufuale-, Common Plai- I 3. Alabaftrum ; Ala^ 

 fier. I bafter. 



4. Stirium. Fibrous Alabafter, 4 fpecies; 

 I. Gypfeum ^ Fibrous Gyffum^ or Englifli Talc, 



5. Spatum. Spar. 14 fpecies, 



a. Soluble in aqua fortis. 



5. Compadtum; Sub-dia^ 

 'pbanous compa£i 



1. Speculare ; Soft Spar-, 



of different colours. 



2, Duplicansj Refracting 



Spar. 



Spar^ of different 

 colours. 



0, Tinftunj % 



