MINER A LOG Yr 17 



SECT. X. 



D. Lime or calcareous fpars, Spatum calca- 

 ream, 



1. Of a rhomboidal figure. 



a. Tranfparent or diaphanous. 



1. Refracting fpar, Spatum ijlandicum. 

 This repreients the objects, feen thro' it* 



double, it is found at Brattforfs, an iron 

 mine in the province of Wermeland, and 

 alfo in Switzerland and Iceland *• 



2. Common fpar, which fhews the objecl: 

 finq-le. 



i. White, or colourlefs. 



2. Yellowifh and phofphorefcent, is 

 found atjonufwando in Torneo Lapp- 

 mark in the Swedifh Lapland. 



b. Opaque, Spatum romhoidale opacum. 



1 . White, is found in many places, moftly 

 in clefts, and among cryftallifations. 



2. Black, from Winorn at Kongfberg in 



Norway. 



3. Brownifh yellow, at Salberg. 



2. Foliated or plated fpar, Lamellofum. 



This has no rhomboidal figure, but breaks 

 into thin plates fo placed as to be not unlike 

 meets of thin paper, laid over each other. 



a. Opaque white, Spatum lamellofum opa- 

 cum, from Winorn at Kongfberg, and 

 Scaragrufvan at Egeren in Norway. 



* There are vaft quantities of refra&ing fpar (a variety 

 of the Iflandic) found in the lead mines of Derby fhire, Wales, 

 and many other parts of England. D.C. 



C SECT. 



