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2°. MARMOR 



r Marb le. 



U R A 



H 



T 



Concaceum figuris variis intertextu 

 Nigrum alio & rubello variegatum 



The Kilkenny marble. 



The marble is a flone of great beauty, and fine grain ; bears a good polifli 

 appears with a brightnefs fuperior to mod of the other productions of the clafs 

 found in large mafTes feemingly compofed of fmall feparate concretions of 



an 



it is 



and forms, mixed 



were in a folution of felenitic matter, which 



ays 



appears more or lefs tranfparent about them. Its texture is deftroyed equally both by 

 the fire and the acid. 











3°* 



CALCITARIUM 



Lime-jl 



one. 





1. RufefcenSyfelenitideJlridtum. 



2. Lacleum, parti culls fere impalpabilibus, 

 'Jamaica marble. 



3 . Cinereum & fubgrifeum rude ; particulis grojjt 





Lime-flones are found in great abundance in moft countries ; and feem to keep a 

 medium between the marble and the grain or free-ftones. They are commonly 

 impregnated much with fmall felenetic cryftals, and eafily known by their more 



fi 



lefs mining furfaces, and the eafe with which they yield to both the acid and the 



. 







4°. SIMPLEXIA 



Ihe Free -Jl one. 





Mollior albida particulis j ere wipalpabilibus, 

 The Free-flone of 'Jamaica and A?itigua. 

 Mollior £? levior nivea, 

 The Bermudas free-ftone 



particulis arenofis conjt 





Cinerea particulis arenofis equalibu 

 Portland frone. 



I 



The free-ftone is generally of a plain uniform ftructure, and granulated texture : 

 it fplits with equal facility in all directions, and is very eafily broke when firfl taken 

 out of its native bed, but hardens foon in the more open air $ it yields equally to 

 both the fire and the acid. 



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T. 



VIIL 



1 



» 



De produElionibus nonnullis prior ibus nonproprie fubjiciendis. 

 Of different productions which can't be fb conveniently placed under 





the foregoing Clafles or Genera. 







w 



E difpofe the more mixed and uncertain productions of the mineral king 



dom in this clafs : for the freq 



well as in the courfe of 



appearance of them in collections 



nor 



their uncertain 

 ged among the foi 



nature, would not admit me to pafs them over in filence ; 

 difpofitions, forms and mixtures, allow that they mould be 



'•■. 



We fhall difpofe them in the following order^ viz. 







A 





j. 



i°. PUMEX 



Tummy* 



Plumbagineus vulcaniarum 





Pyrites cinereus* . 

 Varius miner alium 

 Ater vegetate Hum, 



Pumax ojf* 





The different forts of pum 



nly the productions of fire; and conftituted of 



the frnaller particles of more fixed terrene bodies ; agitated by heat, and raifed with 



volatile particles, with which they might have been 



the fumes, and 



:h 



linked 



connected 



more 



2 



o 



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