Miner alogical Journey. 133 



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

 opening which has been made 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, imperfectly form- 

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

 ticles of white Felspar and Amianthus are disseminated. The col- 

 or is a pale, yellowish green. 



Upon either side of the last mentioned excavation, the Garnet, 

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

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

 Schiefer-spar, filaments of the variety of Hornblende called SyssoUte, 

 and imperfectly formed crystals of Quartz. The former of these 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 

 crystals of Garnet and Quartz in little tufis, consisting of green fila- 

 ments. 



At the same place is found also, among the masses of gneiss thrown 

 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 specimen of purple Fluor was likewise picked 

 up in this vicinity. 



With the crystals of Hornblende, which next to the Garnet, is the 

 most abundant crystallized mineral of the mountain, I shall conclude 

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

 mensions, 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. The modification they affect, is simply that 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 either of the adjacent faces being 153° 

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

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

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

 seams, two or three inches in width, among the ore. This aggregate is 



