MINERALOGY. 77 



clofely confined in different fubftances : fmce 

 garnets are generally found difperfed in 

 other folid ftones, and oftentimes in the 

 harder ones, fuch as quartz and chert*. 



SECT. LXIX. 



1. Garnet, Granatus. 



Which is a heavy and hard kind of ftone, 

 criftallifmg in form of polygonal balls, and 

 is moilly of a red, or reddifh brown co- 

 lour. 



A. Garnet mixed with iron, Granatus mar- 

 tialis. 



* It is certain, that the metallic calces being mixed with 



other earthy fubftances, make great alteration in refpecl to 



their fufibiiity ; and we know from experience, that the 



prefence of iron in the argillaceous, and moft particularly 



in the micaceous kinds, renders them fulible ; however, 



though there may be gcod reafons for confidering the garnet 



as a quartz impregnated wi:h iron; yet as quartz becomes 



lefs fulible by any addition of iron, of which the Swedifh 



Tcrrften, (Seel, ccxiii. in the note) a martial ore, commonly 



mixed with quartz, is an inflance ; and as even the fpecies 



of quartz naturally mixed with thn.* metal, (Seel. liii. A,) 



are far lefs eafily fufible than the garget ; it migru perhaps 



be better to cail the garnet a froi.e of a different order, until 



by fufneient experiments we m?y have rsafon to reduce the 



number of the earths. Though if we mould ever arrive at 



an exact method of claffing in this refpecl, perhaps the 



cecorcmical ufe of thefe bodies will rather require fuch a dif- 



t ibution of them as (hall more regard their prefent exigence, 



than that which they have been originally derived from. 



The garnet earth, fo far as I know, is not yet found, but 

 in an irdurated fta'c ; and, as fuch, it is divided into the 

 garnet, and irtto fhirl or cockle, and that in regard to the 

 figure of their criftals, more than any thing efle : though 

 their colour has alio had (feme mar? in this divifion. I have 

 "here followed cuftorn, which, perhaps, m*y have fome rea- 

 fen, however ill founded it be. 



i. Coarfe 



