I 



The col- 



Mlneraloglcal Journey. ] 33 



dicluoisiu, above described. At the lower extremity of the largest 

 openmg which has beenn:iade for ore, in a heap of stones, long since 

 thrown out, masses of still another variety of this mineral frequently 

 occur. They are made up of minute, but brilliant, hnperfectly form- 

 ed, and confusedly aggregated prisms; throughout which, small par- 

 ticles of white Felspar and Amiandius are disseminated. 

 or is a pale, yellowish green. 



Upon eidier side of the last mentioned excavadon, the Gai-jicj, 

 which lies in immense heaps, is less compact ; and frequcndy con- 

 tains small cavities, either partially, or entirely occupied by plates of 

 Schiefer-spar^ filaments of the variety of Hornblende called ByssoUtc^ 

 and imperfectly formed crystals of (Quartz. The former of tl^ese min- 

 erals reminded us at first glance, by its high nacreous lustre as well 

 as the crossing and interlacing of its laminae, of the species Stilbite; 

 but a nearer examination evinced the characteristic cleavages of cal- 

 careous spar, to which species it belongs, and of which it forms an 

 extremely delicate variety. The Byssolite is implanted upon the 



Q 



ments. 



Gneiss 



out from the excavation, white Mesotype^ occupying narrow seams 

 nearly perpendicular to its stratification. It exists in very closely ag- 

 gregated fibres, an inch or more in length, and disposed in a sheaf- 

 like manner. A single 

 tip in this vicinity. 



Fluor 



n 



w 



most abundant crystallized mineral of the mountain, I shall conclude 

 my notice of the present locality. These, though not of large di- 

 niensions, we considered as very interesting on account of their high 

 lustre and jetty black color. They are never regularly terminated ; 

 but their lateral planes are always perfect and constant in their inclina- 

 tions to each other. Tlie modification they affect, is simply tlrai of 

 the primary rhombic prism, having the obtuse lateral edges replaced 

 by tangent planes : the primary planes inclining to each other under 

 an angle of 124^ 40' and 55^^ 20' (Reflective Goniometer) ; the incli- 

 nation of the secondary plane to eltlier of the adjacent faces being 1 52*^ 



15'. The two nordiern excavations produce this mineral; though 

 under somewhat different circumstances, at each. From the shaft, 

 it is brouglit up contained in a mixture of chlorite and mica, forming 

 seaius, two or three inches in width, among the ore. This aggi-egate is 



