MINERALS. 5 



bitumen becomes Coal. Schift is however often refolved into earthy 

 Ochrcy which by muhiplied mineralization is regenerated into To^h, 



CALX, the earth of animals, combined with Natrum, alcaline, of 

 a whitifh colour, abforbing acids, eafily fcraped with a knjfe, fa- 

 rinaceous when dry, penetrable by fire, elfervefcing when burnt, 

 calcifying moift and argillaceous extranepus fubflances into Marble; 

 but when refolved and faturated wiih acid is recryftallized inJo 

 Gyfjuniy not again efFcrvefcing with acid without depuration by 

 fire, aiKl each is refolved by the elements into farinous Chalky 

 concreting by asthcreal water into Flinty but when refolved is re* 

 cry ftallijed into 5'/>tfr. 



Xhefe are the mothers of ftpnes, 



STONES grow from earths, a^e again refolved^ and again repro- 

 duced. 



Clay is attracted into Talcy refolved into Lithomarg^ and rege- 

 nerated into Amlant, 



Sand accretes together into Free-Jtoney is refolved into Gravel, 

 and regenerated into Rock, 



Soil is cemented irito Schifl^ refolved into Ochre^ and regene- 

 rated into Toph, 



Calx is coagulated into Ma {hie y refolved into Chalky and rege- 

 nerated into Alal)aJ}er. 

 Piaphanous ftones have their origin from a fluid rpother, opake 

 ftones from a fixed one. They are often tinged with a vitrioiic 

 alumen, varying in coloui according to their various tinctures, and 

 by thefe are filled and confolidate4 with a cicatrix the fiifures of 

 rocks. 



Mica^ the concretion of clay, is fcaly, flexile, opake, fhining, 

 becoming mofe rigid in jgriition and ^t the farne time more fliining. 



^iariZf the cryliailization of elementary water^ is pellucid, 

 hard, from the watery cavities of rockt, and therefore always pa- 

 rafitic, its cryitals being often pbfcured by abrafjon or by its bulk. 



Spar, the cryflallization of calcareous water, is diaphanous, 

 fragile, whofc internal rhombs an adept will eafily diliiriguilh from 

 a different cryflal ; adulterated witji iron it becomes harder and 

 Itrikes fire with fteel. 



CRYSTALS are ftopy, produced in and fron-j watef impregnated 

 but not faturated with fait, which abounds with impalpable ler- 

 reftrial atoms and is retained in the cavities of ftones They in- 

 creafc by long and yndifturbed habitation, and are not again foiu- 

 ble by water into impalpable atoms. In their many-fided figure 

 they differ from all other ftones, nor have ihey any other however 

 common to moft falts, which is the fole caufe of cryftalization at 

 prefent known, nor would falts have a determinate figure unlefs by 



